Sheldon Brown's Bottom Bracket Size Database

Sheldon Brown's

Bottom Bracket Size Database

Avocet
Bontrager
Bulletproof
Campagnolo
Coda
Mavic
Ofmega
Ritchey
Shimano
Sakae/Ringyo (SR)
Stronglight
Sugino
Sun Tour
TA
Thorn
Truvativ

This page is a listing of various bicycle cranksets, and the bottom brackets that fit them.

Sheldon solicited information from readers to collect this data but that project is on hold until we set up a new mechanism for collecting and posting additional data. We'll take corrections to existing information. This is the information he collected:

Crank Make

Examples: Campagnolo, Nervar, Shimano, Stronglight, SR (Sakae Ringyo) Sugino, TA, Takagi

Crank Model

Single-Double-Triple

Spindle/BB Code and Size

Examples: D3H, 68 ss 120, UN72 68 x 113, UN52 70 x 107, 344...See the section for your brand of crank for details of the measurement system used. As far as crank interchangeability is concerned, the most important thing is the overall length, and the offset if the spindle is longer on one side than the other (that's true of many older units.)

Spec or Measurement

"Spec" indicates that you got the information from a manufacturer's data sheet or other publication. "Measurement" indicates that you have measured a crank installed on a bicycle. Please measure everything in millimieters.

Tapered square or splined?

Most cotterless cranks use tapered square axles. Some newer models are splined. For splined cranks, it would be helpful to specify the spline pattern if known.

Items above in red are essential. If you can't supply all 5 of these bits of info, don't bother submitting.
If you can fill in any of the additional items below, it will make your submission more useful

Chainline

See the chart below for an explanation of how to measure chainline

Chainring Clearance

This would be the distance from the inner surface of the innermost chainring to the centerline of the seat tube or down tube.

Right Crank clearance

This would be the distance from the inside of the right crank to the centerline of the seat tube or down tube, measured at the centerline of where the pedal screws in.

Left Crank clearance

This would be the distance from the inside of the left crank to the centerline of the seat tube or down tube, measured at the centerline of where the pedal screws in.

Tread (a.k.a. "Q factor")

This is the horizontal width of the crankset from pedal mount to pedal mount. It is equal to the sum of the crank clearances above, plus the thickness of each crank. I can do the math if you provide the measurements.

Bolt Circle Diameter

This is a useful item if you know it.

Accuracy

Most of the size information on this list was provided by people like you. I have no way to check the accuracy of the data. It should be noted that frames can be reamed out to take a larger sized seatpost, and sometimes a replacement seatpost may be a slightly different size than the original.

Japanese Bottom Bracket Spindles, Traditional Cup And Cone Type

Note: India's standard copies this and lists more spindles. See listing in PDF document

DESCRIPTION

Size Code	Shell Width	D Length Overall	A Length Left End	B Length Middle	C Length Right End	Symmetrical Equivalent
3H	68	113	30.5	52	30.5	113
3K	68	117.5	32	52	33.5	119
3P	68	119	32	52	35	122
3N	68	120	32	52	36	124
3S	68	124.5	35	52	37.5	127
3T	68	123	32	52	39	130
3NN	68	124	36	52	36	124
3U	68	124.5	32	52	40.5	133
3TR	68	133	42	52	39	130
3RR	68	136	42	52	42	136
5N	70	122	32	55	35	125

Substituting the "symmetrical equivalent" bottom bracket will preserve the position of the right crank and chainwheel, but the left side will often wind up farther out.
These spindles are getting harder and harder to find. In many cases, it makes more sense to upgrade to an inexpensive modern cartridge bottom bracket.
"3" series spindles normally fit 68 mm ISO/British/French bottom brackets.
"5" series spindles normally fit 70 mm Italian bottom brackets, also 68 mm French with thin cups.
"7" series spindles fit "oversized" 73 mm ISO/British bottom brackets, sometimes also work with Raleigh 26 TPI cups in older Nottingham-built Raleigh bikes. It may be necessary to use 15/64" or

Model	Single/ Double/ Triple	Length	Type: Square/ Splined	Chainline	Chainring Clearance	Right Crank Clearance	Left Crank Clearance	Tread (Q factor)	BCD	Chainring clearance more with steel inner ring, less with aluminum.
Avocet - See Ofmega
Bontrager (Truvativ)
All Square Type	Triple/Single	113	Square	48.5	39.6/38.6	71 +/- 1.5	71 +/- 1.5	168	104/64 4-arm
MTB Splined Type	Triple/Single	113	ISIS	48.5	39.6/38.6	71 +/- 1.5	71 +/- 1.5	168	104/64 4-arm
Road Splined Type	Double	108	ISIS	43.5					130
Road Splined Type	Triple	118	ISIS	45					130/74
Bulletproof
Model	Single/ Double/ Triple	Length	Type: Square/ Splined	Chainline	Chainring Clearance	Right Crank Clearance	Left Crank Clearance	Tread (Q factor)	BCD	Notes
BMX	Single/Double	107	Square	43.4*	38.4			158	110	*43.4 chainline as double. 39.9 inner position, 46.9 outer position.
Campagnolo Sorry, no other data yet on this brand.
Model	Single/ Double/ Triple	Length	Type: Square/ Splined	Chainline	Chainring Clearance	Right Crank Clearance	Left Crank Clearance	Tread (Q factor)	BCD	Notes
Record 9	Double	116	Square		47	73	74	Edco Competition Cartridge BB (older model) bb spindle - 116 mm offset
For more info on Campagnolo Models, see Martin Trautman's site
Coda Sorry, no data yet on this brand.
Mavic Sorry, no other data yet on this brand.
	Double	113	Square						130
Ofmega (Avocet) Ofmega cranks, including those branded "Avocet" use a non-standard spindle, thinner than either J.I.S. or ISO spindles. As far as I know, nothing else works.
Ritchey (Sugino) Sorry, no other data yet on this brand.
Logic	Triple	120	Square	122.5 mm UN-72 is the best Shimano replacement 118.5 mm Phil Wood barely fits Bridgestone XO-1				154	110/74
Logic Compact	Triple	110-113	Square					154 w/113	94/58
Shimano Cartridge Bottom Brackets Shimano cartridge bottom brackets are typically coded with a model designation and two numbers: shell width and length. Model designations include: Square Taper: CT21, LP27, UN40, UN51, UN52, UN71, UN72, UN91. These are all interchangeable if the other numbers match. Listed in order of quality, CT21 is worst, UN91 is best. Octalink ® V1 Spline: 9 speed BB-M952 (XTR), BB-7700 (Dura-Ace), BB-6500 (Ultegra), BB5500 (105) V1 BB spline grooves 5 mm long, ridges 2.2 mm wide. Octalink ® V2 Spline: 9 speed ES70/71, ES50/51 (Deore XT M571/572, Deore LX M751/751, M510-8, M440-8, also 2005 Tiagra FC4401 & 4404, 2005 Sora FC-3001 & 3004) V2 BB spline grooves 9 mm long, ridges 2.8 mm wide. Note: Octalink ® V1 and V2 splined bottom brackets are very similar looking but if you use the wrong version you will ruin your crank! If in doubt, measure. The wider ridges of an Octalink V2 spindle plow into the grooves in an Octalink V1 crank. Thanks to David Richardson for the photo. Hollowtech II ® Two-Piece Cranksets: Shimano's latest top-of-the line system is a two-piece crankset. One piece is the combined right crank and spindle, the other piece is the left crank. Hollowtech II uses separate bearing modules that screw onto the opposite sides of the frame. Since the spindle is part of the right crank, there's no issue of compatibility. All Hollowtech II cranks work with all Hollowtech II bearing units. Any crank that fits on one type of spindle will fit on all spindles of that type, but if the length is incorrect, the chainline/clearance will vary. Shell width in millimeters: 68 for standard ISO/British 70 for Italian 73 for oversized ISO/British. This dimension has to do with what kind of frame the bottom bracket fits, and has nothing to do with the crank. Length: overall spindle length in millimeters. This will determine the chainline and various clearance dimensions. Shimano sometimes specs two different lengths for the same crankset. This usually relates to the diameter of the seat tube. The shorter dimension is normally preferred, but bikes with fat seat tubes may require the longer size to accommodate the swing of the front derailer.
Shimano Cranksets 105 200 \| 200 \| 300 600 700 Acera \| Alivio \| Altus Deore Dura-Ace Exage Hone Nexave Nexus RSX RX100 Saint Sora STX Tiagra Ultegra XTR
Model	Single/ Double/ Triple	Length	Type: Square/ Splined	Chainline	Chainring Clearance	Right Crank Clearance	Left Crank Clearance	Tread (Q factor)	BCD	Notes
Shimano 105
Model	Single/ Double/ Triple	Length	Type: Square/ Splined	Chainline	Chainring Clearance	Right Crank Clearance	Left Crank Clearance	Tread (Q factor)	BCD	Notes
105-SC 1055	Double	113 (115)	Square	43.5					130	7-speed 1990-92
105-SC 1056	Double	107	Square	43.5					130	8-speed 1993-
105-SC 1057	Triple	118	Square	45					130/74	8-speed 1996-
105 5500	Double	109.5	V1 Spline	43.5					130	9-speed 1999-2000
105 5501	Double	109.5	V1 Spline	43.5					130	Hollowtech, 2001-02
105 5503	Triple	118.5	V1 Spline	45					130/74	9-speed 1999-2000
105 5504	Triple	118.5	V1 Spline	45					130/74	Hollowtech, 2001-02
Shimano 200-700 (See also Exage and Ultegra)
Model	Single/ Double/ Triple	Length	Type: Square/ Splined	Chainline	Chainring Clearance	Right Crank Clearance	Left Crank Clearance	Tread (Q factor)	BCD	Notes
200CX M202-C	Triple	127.5	Square						riveted	7-speed 1992
200GS M201	Triple	121	Square						riveted	7-speed 1990
300EX A300	Double	115	Square	43.5					130	8-speed 1996-99
400CX C400	Triple	113-118	Square	45-47.5					110/58	7-speed 1993-94
700CX C700	Triple	113-118	Square	45-47.5					110/58	7-speed 1993-94
Shimano Acera / Alivio / Altus
Model	Single/ Double/ Triple	Length	Type: Square/ Splined	Chainline	Chainring Clearance	Right Crank Clearance	Left Crank Clearance	Tread (Q factor)	BCD	Notes
Acera M330	Triple	110-113	Square	47.5-50					61 mm	1999-2000
Acera MC19	Triple	110-113	Square	47.5-50					61 mm	8-speed 2001
Acera-X M290	Triple	110-113	Square	47.5-50	Recalled! Do Not Use! See Shimano dealer for free replacement.					Compact 1995
Acera-X M291	Triple	110-113	Square	47.5-50					riveted	1996-98
Alivio MC10	Triple	110.5-113	Square	47.5-50					95 (!)/58	Compact 1994
Alivio MC11	Triple	110.5-113	Square	47.5-50					riveted	Compact 1994
Alivio MC12	Triple	110-113	Square	47.5-50	Recalled! Do Not Use! See Shimano dealer for free replacement.					Compact 1995
Alivio MC14	Triple	110-113	Square	47.5-50					67(!)	1996-97
Alivio MC16	Triple	110-113	Square	47.5-50					67(!)	1997-98
Alivio MC18	Triple	110-113	Square	47.5-50					104/64	1999
Alivio MC20	Triple	110-113	Square	47.5-50					104/64	8-speed 2000-01
Altus CT90	Triple	116-121	Square	47.5-50	Recalled! Do Not Use! See Shimano dealer for free replacement.					Compact 1995
Altus CT91	Triple	116-121	Square	47.5-50					riveted	1996-97
Altus CT92	Triple	116-121	Square	47.5-50					riveted	1997-99
Altus CT93	Triple	116-121	Square	47.5-50					riveted	1999-2001
Altus C50 CT50	Triple	122.5	Square	47.5					riveted	1994-95
Shimano Deore
Model	Single/ Double/ Triple	Length	Type: Square/ Splined	Chainline	Chainring Clearance	Right Crank Clearance	Left Crank Clearance	Tread (Q factor)	BCD	Notes
Deore M440,480,510	Triple	110-113	Square	47.5-50					104/64	9-speed 2000-05
Shimano Deore DX
Deore DX MT60	Triple	122.5	Square						110/74	1990-1993
Shimano Deore LX
Deore LX M550	Triple	122.5	Square						110/74	1990-1992
Deore LX M560	Triple	113-118	Square						110/74	1993
Deore LX M563	Triple	107-113	Square	47.5-50					94/58	Compact 1994-96
Deore LX M569	Spiderless	107-113	Square	47.5-50						1997-98
Deore LX M570	Spiderless	110-113	Square							1999
Deore LX M571	Spiderless	113-118	V2 Spline							9-speed 2000-04
Deore LX M580, M581	Spiderless	Hollowtech II		50						9-speed 2005
Shimano Deore XT
Deore XT M730	Triple	122.5	Square						110/74	1990-1993
Deore XT M737	Triple	107-113	Square	47.5-50					94/58	Compact 1994-96
Deore XT M739	Triple	107-113	Square	47.5-50					Spiderless	Compact 1997-99
Deore XT M750	Spiderless	110-113	Square							1999
Deore XT M751	Triple	113-118	V2 Spline	47.5-50					104/64	9-speed 2000-03
Deore XT M760, M761	104/64	Hollowtech II		50						9-speed 2004 and later
Shimano Dura-Ace
Model	Single/ Double/ Triple	Length	Type: Square/ Splined	Chainline	Chainring Clearance	Right Crank Clearance	Left Crank Clearance	Tread (Q factor)	BCD	Notes
Dura-Ace 7200	Double	112-113	Square	43.5					130	6-speed 1980s Symmetrical spindle 112 for 68 mm BB; 113 for 70 mm (Italian)
Dura-Ace 7400-7402	Double	112-113	Square	43.5					130	8-speed 1990-95 Right end of spindle 3 mm longer 112 for 68 mm BB; 113 for 70 mm (Italian)
Dura-Ace 7410	Double	103	Square	43.5					130	8-speed 1996
Dura-Ace Aero BB-7300 (7500 AX)	Double	107-109	Square	43.5					130	6-speed 1980s Symmetrical spindle 107 for 68 mm BB; 109 for 70 mm (Italian). Uses special cups, will not fit through hole in others.
Dura-Ace 7600	Single	109	Square	43	40.6	56.3	56.3	139.4	144
Dura-Ace 7700	Double	109.5	V1 Spline	43.5					130	9-speed, 1997-2000
Dura-Ace 7701	Double	109.5	V1 Spline	43.5					130	Hollowtech, 2001-03
Dura-Ace 7700	Triple	118.5	V1 Spline	47.5					130/92	9-speed, 2002 and later
Dura-Ace 7800	130	Hollowtech II		43.5						10-speed 2004 and later
Shimano Exage
Model	Single/ Double/ Triple	Length	Type: Square/ Splined	Chainline	Chainring Clearance	Right Crank Clearance	Left Crank Clearance	Tread (Q factor)	BCD	Notes
Exage 300X A300	Double	113	Square	43.5					130	7-speed 1990-92
Exage 300LX M300	Triple	121	Square						110/74	7-speed 1990-92
Exage 400X A400	Double	113	Square	43.5					130	7-speed 1990-92
Exage 400LX M400	Triple	121	Square						110/74	7-speed 1990-92
Exage 500X A500	Double	113	Square	43.5					130	7-speed 1990-92
Exage 500CX M400-C	Double	122.5-127.5	Square							7-speed 1992
Exage 500LX M500	Triple	121	Square						110/74	7-speed 1990-91
Exage ES M520	Triple	113-118	Square	47.5-50					110/74	7-speed 1993
Exage LT M320	Triple	113-118	Square	47.5-50					110/74	7-speed 1993
Shimano Hone
Hone M600		Hollowtech II		57.5					104/64	9-speed 2005 and later
Shimano Nexave
Nexave T410	Triple	117.5	Square	47.5					104/64	2000
Nexave T411	Triple	116-121	Square	47.5-50					riveted	2000
Nexave T300 T300-S	Triple	117.5	Square	47.5					riveted	2002
Nexave T300 T303	Triple	117.5	Square	47.5					riveted	2000-02
Nexave T400 T410	Triple	117.5	Square	47.5					110/64	2002
Nexave T400 T411	Triple	117.5	Square	47.5					79	2002
Nexave C600 C600	Double	117.5	Square	52.5					112	2000-02
Nexave C900 C900	Double	121	Square	52.5					112	2000-02
Shimano Nexus Inter C
Model	Single/ Double/ Triple	Length	Type: Square/ Splined	Chainline	Chainring Clearance	Right Crank Clearance	Left Crank Clearance	Tread (Q factor)	BCD	Notes
Nexus Inter C NX70	Single	116	Square	45					Swaged	For internal hubs
Nexus Inter C NX40	Single	116	Square	45					Swaged	For internal hubs
Nexus Inter C NX40	Single	116	Square	45					Swaged	For internal hubs
Nexus Inter C 510	Single	122.5	Square	45					Swaged	For internal hubs
Shimano RSX
Model	Single/ Double/ Triple	Length	Type: Square/ Splined	Chainline	Chainring Clearance	Right Crank Clearance	Left Crank Clearance	Tread (Q factor)	BCD	Notes
RSX A410	Double	110	Square	43.5					110	36-46 1995-1997
RSX A413	Triple	118	Square	45					110/74	26-36-46 1995-1997
RSX A416	Double	110	Square	43.5					130	42-52 1999-2000
RSX A417	Triple	118	Square	45					130/74	30-42-52 1999-2000
Shimano RX100
RX100 A550	Double	113	Square	43.5					130	7-speed 1990-93
RX100 A551	Double	107	Square	43.5					130	8-speed 1994-2000
RX100 A550-T	Triple	122.5	Square	47.5					130/74	8-speed 1996-2000
Shimano Saint
Saint M805		Hollowtech II		57.5					104/64	9-speed 2004 and later
Shimano Sora
Sora 3300	Double	110	Square	43.5					130	8-speed 2001-04
Sora 3303	Triple	113	Square	45					130/74	8-speed 2001-04
Sora 3301	Double	113	V2 Spline	43.5					130	8-speed 2005
Sora 3304	Triple	118	V2 Spline	45					130/74	8-speed 2005
Shimano STX, STX-ES, STX-RC
STX MC30	Triple	110.5-113	Square	47.5-50					95 (!)/58	Compact 1994
STX MC32	Triple	110-113	Square	47.5-50					94/58	Compact 1995-96
STX MC34	Triple	110-113	Square	47.5-50					94/58	Compact 1997-
STX-SE MC31	Triple	110.5-113	Square	47.5-50					95 (!)/58	Compact 1994
STX MC34	Triple	110-113	Square	47.5-50					94/58	7-speed 1996-98
STX-RC MC33	Triple	110-113	Square	47.5-50					94/58	Compact 1995
STX-RC MC36	Triple	110-113	Square	47.5-50					94/58	8-speed Compact 1996-97
STX-RC MC40	Spiderless	110.5-113	Square	47.5-50						1998-99
Shimano Tiagra
Model	Single/ Double/ Triple	Length	Type: Square/ Splined	Chainline	Chainring Clearance	Right Crank Clearance	Left Crank Clearance	Tread (Q factor)	BCD	Notes
Tiagra 4400	Double	110	Square	43.5					130	9-speed 2001-04
Tiagra 4403	Triple	113	Square	45					130/74	9-speed 2001-04
Tiagra 4401	Double	113	V2 Spline	43.5					130	9-speed 2005
Tiagra 4404	Triple	118	V2 Spline	45					130/74	9-speed 2005
Shimano Ultegra (600 Ultegra)
Model	Single/ Double/ Triple	Length	Type: Square/ Splined	Chainline	Chainring Clearance	Right Crank Clearance	Left Crank Clearance	Tread (Q factor)	BCD	Notes
600 Ultegra 6400	Double	113 (115)	Square	43.5					130	6-/7-speed 1990 8-speed 1991-96
Ultegra 6500	Double	109.5	V1 Spline	43.5				147	130	9-speed 1998-2004
Ultegra 6500	Triple	118.5	V1 Spline	45				156	130/74	9-speed 1998-2004
Ultegra 6600	Double	Hollowtech II		43.5					130	10-speed 2005 and later
Ultegra 6603	Triple	Hollowtech II		43.5					130/74	10-speed 2005 and later
Shimano XTR
Model	Single/ Double/ Triple	Length	Type: Square/ Splined	Chainline	Chainring Clearance	Right Crank Clearance	Left Crank Clearance	Tread (Q factor)	BCD	Notes
XTR M900	Triple	107-113	Square	47.5-50					110/74	8-speed 1992-95
XTR M950	Triple	112-116	SV1 Spline	47.5-50					112/68 4 arm	8-speed 1996-
XTR M950-HG	Triple	112-116	V1 Spline	47.5-50					110/74	8-speed 1996-97
XTR M951	Spiderless	112-116	V1 Spline	47.5-50						8-speed 1998
XTR 952	Spiderless	112-116	V1 Spline	47.5-50					110/68	9-speed 1999-2003
XTR 960	Triple	Hollowtech II		47.5-50					146/102/64	9-speed 2004 and later
For more info on Shimano Models, see Martin Trautman's site
Sakae Ringyo (SR) Sorry, no data yet on this brand.
Stronglight See also: TA for older models.
Sugino
Model	Single/ Double/ Triple	Length	Type: Square/ Splined	Chainline	Chainring Clearance	Right Crank Clearance	Left Crank Clearance	Tread (Q factor)	BCD	Notes
AT	Triple (Made for an asymmetrical spindle.)	127.5 + 2 mm spacer	Square					150	110/74	Shimano UN-72 BB.
		122.5 + 2 mm spacer	Square					150	110/74	'80s Shimano UN72 w/2 mm spacer on right
		115.5 + 2 mm spacer	Square	42.5				139	110/74	Shimano UN-73 BB.
700CX 4-bolt	Triple	110-113	Square						104/58	2001
EX 4-bolt	Triple	110-113	Square						104/64	2001
'97 Impel 5-bolt	Triple	110-113	Square						110/74	2001
XD 300 5-bolt	Triple	113-118	Square						110/74	As short as 107 works with some road bikes.
XD 500 5-bolt	Triple	113-118	Square						110/74	2001 As short as 107 works with some road bikes.
XD 600 5-bolt	Triple	113-118	Square						110/74	As short as 107 works with some road bikes.
75	Track	109 ISO	Square						144	Sugino BB-SG75
		Alternate: Campagnolo 110.5 ISO			Chain line will be 1.5 mm wider than normal, according to Sugino
		Alternate: Phil Wood 108 ISO			Chain line will be 1 mm narrower than normal, according to Sugino
RD 5-bolt	Single	103	Square	42					130	2004
Sun Tour
Model	Single/ Double/ Triple	Length	Type: Square/ Splined	Chainline	Chainring Clearance	Right Crank Clearance	Left Crank Clearance	Tread (Q factor)	BCD	Notes
Cyclone 7000	Double	Shimano 110	Square	43.1	38.1	30.5	30.5	146.2	130	Early '90s
Superbe Pro	Double	Campagnolo 111	Square	43.5	39	59	60	143	130	Early '90s
T.A. Cyclotouriste (Generally interchangeable with older Stronglight)
Ref.#	Length	Application
#314	111.5 mm	(track)
#344	118.5 mm	(double)
#373	120 mm	(road triple)
#374	123.5 mm	(road triple)
#375	127 mm	(tandem)
#376	133.5 mm	(MTB triple)
Model	Single/ Double/ Triple	Length	Type: Square/ Splined	Chainline	Chainring Clearance	Right Crank Clearance	Left Crank Clearance	Tread (Q factor)	BCD	Chainring clearance more with steel inner ring, less with aluminum.
Cyclotouriste	Double	Shimano UN52 115 mm	Square	43				134.4	50.4 mm	Sheldon Brown's Hetchins
Zephyr	Double	110	Square	43	36	61	59	147	130
Thorn Sorry, no other data yet on this brand.
Tandem	Triple	113	Square	113 spec, but 107 works a lot better. This gives a proper 47.5 mm chainline and lower Q-factor				162	110/74
Truvativ
Model	Single/ Double/ Triple	Length	Type: Square/ Splined	Chainline	Chainring Clearance	Right Crank Clearance	Left Crank Clearance	Tread (Q factor)	BCD	Chainring clearance more with steel inner ring, less with aluminum.
Square Taper Models
Firex	Triple/Single	113	Square	48.5	39.6/38.6	71 +/- 1.5	71 +/- 1.5	168	104/64 4-arm
FiveD	Triple/Single	113	Square	48.5	39.6/38.6	71 +/- 1.5	71 +/- 1.5	168	104/64 4-arm
Hussefelt	Triple/Single	113	Square	48.5	39.6/38.6	71 +/- 1.5	71 +/- 1.5	172	104/64 4-arm
Stylo	Triple/Single	113	Square	48.5	39.6/38.6	71 +/- 1.5	71 +/- 1.5	168	104/64 4-arm
X-Forge	Triple/Single	113	Square	48.5	39.6/38.6	71 +/- 1.5	71 +/- 1.5	168	104/64 4-arm
ISIS Drive Splined Models
Firex	Triple/Single	113	ISIS	48.5	39.6/38.6	71 +/- 1.5	71 +/- 1.5	168	104/64 4-arm
FiveD	Triple/Single	113	ISIS	48.5	39.6/38.6	71 +/- 1.5	71 +/- 1.5	168	104/64 4-arm
Holzfeller	Triple/Single	113	ISIS	48.5	39.6/38.6	71 +/- 1.5	71 +/- 1.5	172	110/74 5-arm
Hussefelt	Triple/Single	113	ISIS	48.5	39.6/38.6	71 +/- 1.5	71 +/- 1.5	172	104/64 4-arm
Stylo	Triple/Single	113	ISIS	48.5	39.6/38.6	71 +/- 1.5	71 +/- 1.5	168	104/64 4-arm
	A note regarding chainline: but there is currently confusion in the industry regarding how it is actually measured. For double road cranks and single speed cranks this is straightforward, but for triple cranks there are two current measurement methods: As Shimano, which is outlined on your web page, in which chainline is measured from the frame centerline to the INSIDE surface of the chainring teeth on the middle chainring. As most other manufacturers use, and is defined in the ISIS Drive standard, in which chainline is measured from the frame centerline to the CENTER of the tooth of the middle chainring. For typical 2mm thick chainring teeth, these two measurement methods differ by 1mm, even though the chainring ends up in the same physical location relative to the frame centerline. Hence, a Shimano 47.5 mm chainline is equivalent to an ISIS Drive 48.5 mm chainline. Further, the confusion that your table is attempting to help solve is the same confusion that we tried to address in the ISIS Drive standard. In the case of ISIS Drive, the standard spindle lengths are symmetric and vary in multiples of 5 mm. Thus, if you know the chainline is 48.5 mm with a 113 mm ISIS Drive spindle length, then you automatically know that if you use a 118 mm ISIS Drive spindle length your chainline will increase by 2.5 mm (each crank moves outward 2.5 mm, for a total of 5 mm). A note regarding these differences in chainline measurement on your web page may help some people better understand why a manufacturer claims a 48.5 mm chainline but when they measure it (per Shimano) it is 47.5 mm. Garrett Smith Truvativ International

Chainline Measurement

Chainline is measured from the centerline of the frame to the center of the chain.

You can measure the front chainline directly with a simple ruler. Simply hold the ruler against the seat tube or down tube and measure the distance to the middle of the chainring teeth. In the case of triple chainwheel sets, measure to the middle chainring. In the case of doubles, measure to the halfway point between the two rings.

To measure rear chainline, the easiest way is to measure the distance from the inside of the rear fork end (or the outside of the axle locknut) to the middle of the sprocket.

Double this, subtract it from the over-lock-nut dimension of the hub (or the frame spacing , which should be the same), then divide the result in half, and you have the rear chainline.

DESCRIPTION

This frame has a spacing of 125 mm

Application	Dimension	Notes
Road Double	43.5	Shimano spec, measured to the midpoint between the rings. with typical 5 mm chainring spacing, this puts the inner at 41 mm, the outer at 46 mm.
Road Triple	45	Shimano spec, measured to the middle ring.
MTB Triple	47.5-50 mm	Shimano spec, measured to the middle ring. 47.5 preferred, but for frames with oversized seat tubes, the longer dimension may be needed, because the fat tube places the derailer mechanism farther to the right.
Track/Coaster Brake Traditional One-Speed Most internal gear hubs	40.5-42 mm	Older bikes with 110 spacing would be on the smaller end of this range Newer bikes with 120 mm spacing normally use 42 mm
Singlespeed MTB	52 mm	Wider chainline need for chainstay clearance on MTBs. This is close to the chainline of the outer ring of a typical MTB triple
Rohloff Speedhub	54 mm (58 mm w/13 tooth)
Singlespeed MTB Alternate	47.5 mm	White Industries ENO hubs use this chainline, which lines up with the middle position of a typical MTB triple. It's also fairly close to the outer position of a typical "road" double.

Axle/Crank Interfaces

Square Taper

Traditional cotterless cranksets use a tapered square axle end. The sides of the end taper at a 2 degree angle compared to the centerline, 4 degrees compared to each other.

While there is general agreement about the angle, there is no such agreement about the actual width cut off.

ISO vs J.I.S. Standard

Martin Trautmann posted on rec.bicycles.tech:

L_right = 18 +0.5/-0 mm
L_left  = 16 +0.5/-0 mm
Dimension across flat 1.5 mm from end: 12.6 mm +0.02-0.05
Spindle end to bolt seat:  Loose: 3 mm
                           Tightened: 1.5 mm min.
   
Yet another source claimed that the squares of Campa, Mavic and
Stronglight (ISO) are smaller than Shimano and Suntour (J.I.S.) with the
result that J.I.S. cranks will move about 4.5 mm further in.

This may conflict with the end of the square and result in a loose fit
or breaking stress. For ISO cranks on J.I.S. squares there's less contact
area between crank and spindle, since the crank does not slip perfectly
onto the spindle. The result again is a higher risk of breaking the crank.

But assuming those 4.5 mm and 2 deg, ISO is about 0.3 mm smaller than
J.I.S. (2 * sin 2 * 4.5 = 0.3)?

ISO cranks (Campagnolo, Stronglight, others) won't go as far onto J.I.S. spindles as they ideally should.

J.I.S. cranks (most Japanese models) may bottom out if installed on ISO spindles.

In practice, you can very often get away with mixing these sizes, as long as you select an axle length that gives the desired chainline.

ISIS Drive Spline

In the case of ISIS Drive, the standard spindle lengths are symmetric and vary in multiples of 5 mm. Thus, if you know the chainline is 48.5 mm with a 113 mm ISIS Drive spindle length, then you automatically know that if you use a 118 mm ISIS Drive spindle length your chainline will increase by 2.5 mm (each crank moves outward 2.5 mm, for a total of 5 mm).

Garrett Smith, Truvativ International.

Bottom Bracket Threading

Bottom brackets come in different sizes, according to the nationality of the frame. The table below is for threaded bottom-brackets. For the Ashtabula and other unthreaded bottom brackets, see the unthreaded bottom-bracket cribsheet.

Standard:	Threading	Adjustable (left) cup/cone direction	Fixed (right) cup/cone direction	Shell Width	Applications/Notes
British I.S.O.	1.370" X 24 tpi 1.375" X 24 tpi	right	left	Standard 68 mm O.S. 73 mm	The overwhelming majority of bicycles in current production. British and I.S.O. are interchangeable.
Shimano Hollowtech II, FSA MegaExo, RaceFace X-type	ISO	right	left	90 mm, 95 mm including cups	External cups for cartridge bearings fit British/ISO threaded bottom brackets or unthreaded shell. 24 mm spindle, spacer to use 6805 bearings with 25mm I.D.. Bottom bracket shell must be faced so cups are parallel.
Campagnolo Ultra-torque	Italian or ISO				Spindle diameter 25mm.
Chater Lea	1.450 x 26 TPI	right	left		Obsolete British size but available from Phil Wood & Co.
French	35 mm X 1mm (25.4 tpi)	right	right (wrong!)	68 mm	Obsolete, used on older French bicycles. Prone to problems due to the right-threaded fixed cup, which tends to unscrew itself in use.
ISIS Overdrive I	48 x 1.5 mm	right	left	68mm 100 mm
ISIS Overdrive II	48 x 1.5 mm	right	left	68mm 100 mm	New proposed standard oversized system.
Italian	36 mm X 24 tpi	right	right (wrong!)	70 mm	Italian and some high-end French bicycles. Prone to problems due to the right-threaded fixed cup, which tends to unscrew itself in use.
Phil Wood American Isis (comments)	50 mm	right	left		1.5 mm thread pitch.
Raleigh	1 3/8" X 26 tpi	right	left	71 mm 76 mm	Older British-made Raleighs, 3 speeds and others from the Nottingham factory.
Swiss	35 mm X 1mm (25.4 tpi)	right	left	68 mm	Same thread as French, but fixed cup is left- threaded for reliability.

What happens if you try to mix different sizes:

Bottom Bracket Shell Threading (Below)	British I.S.O. 1.37/1.375" x 24 tpi CUPS R-L (34.8/34.9 x 1.06 mm)	Italian 36 mm X 24 tpi CUPS R-R (1.417" x 1.06 mm)	French 35 mm X 1mm CUPS R-R (1.378 x 25.4 tpi)	Swiss 35 mm X 1mm CUPS R-L (1.378 x 25.4 tpi)	Raleigh 1 3/8" X 26 tpi CUPS R-L (34.9 x 1.06 mm)
British/I.S.O. 1.37/1.375" x 24 tpi (34.8/34.9 x 1.06 mm)	Made to Fit	36 mm Cup diameter is too large, thread won't even start.	Cup diameter is slightly too large, usually won't start. Right (fixed) cup threaded in the opposite direction.	Cup diameter is slightly too large, usually won't start.	Diameter matches, but thread pitch does not. Will bind after only a few threads are engaged.
Italian 36 mm X 24 tpi (1.417" x 1.06 mm)	British/I.S.O. cups fall through	Made to Fit	Italian shells are larger diameter, all other size cups fall right through, threads will not engage.
French 35 mm X 1mm (1.378 x 25.4 tpi)	35 mm = 1.378". Shell is slightly larger, thread pitch slightly finer. Left side may seem to fit, but will be loose.	36 mm Cup diameter is too large, thread won't even start.	Made to Fit	Left (adjustable) side is interchangeable. Right (fixed) side is threaded in the opposite direction, won't fit.	35 mm = 1.378". Shell is slightly larger, thread pitch slightly coarser. Left side may seem to fit, but will be loose.
Swiss 35 mm X 1mm (1.378 x 25.4 tpi)	35 mm = 1.378". Shell is slightly larger, thread pitch slightly finer. May seem to fit, but will be loose.	36 mm Cup diameter is too large, thread won't even start.	Left (adjustable) side is interchangeable. Right (fixed) side is threaded in the opposite direction, won't fit.	Made to Fit	35 mm = 1.378". Shell is slightly larger, thread pitch slightly coarser. May seem to fit, but will be loose.
Raleigh 1 3/8" X 26 tpi (34.9 x 0.977 mm)	Diameter matches, but thread pitch does not. Will bind after only a few threads are engaged.	36 mm Cup diameter is too large, thread won't even start.	Cup diameter is slightly too large, usually won't start. Right (fixed) cup threaded in the opposite direction.	Cup diameter is slightly too large, usually won't start.	Made to Fit

Chainline

Application	Dimension	Notes
Road Double	43.5	Shimano spec, measured to the midpoint between the rings. With typical 5 mm chainring spacing, this puts the inner at 41 mm, the outer at 46 mm.
Road Triple	45	Shimano spec, measured to the middle ring. Note that this results in the middle chainwheel's being to the right of the chainline for the middle rear sprocket.
MTB Triple	47.5-50 mm	Shimano spec, measured to the middle ring. 47.5 preferred, but for frames with oversized seat tubes, the longer dimension may be needed, because the fat tube places the derailer mechanism farther to the right.
Track/Coaster Brake Traditional One-Speed Most internal gear hubs	40.5-42 mm	Older bikes with 110 spacing would be on the smaller end of this range Newer bikes with 120 mm spacing normally use 42 mm
Singlespeed MTB	52 mm	Wider chainline need for chainstay clearance on MTBs. This is close to the chainline of the outer ring of a typical MTB triple
Rohloff Speedhub	54 mm (58 mm w/13 tooth)
Singlespeed MTB Alternate	47.5 mm	White Industries ENO hubs use this chainline, which lines up with the middle position of a typical MTB triple. It's also fairly close to the outer position of a typical "road" double.

Thanks to those who helped by providing data points for this survey:

Evan Marks, Andrew Muzi, Joel Stern, Martin Rockwell, Martin Trautmann, Alex Wetmore...

For more info on Campagnolo and Shimano Models, see Martin Trautman's site

Articles by Sheldon Brown and Others

Harris Cyclery Home Page

If you would like to make a link or bookmark to this page, the URL is:
http://www.sheldonbrown.com/bbsize.html
Last Updated: by John Allen

This page is a listing of various bicycle cranksets, and the bottom brackets that fit them.

Sheldon solicited information from readers to collect this data but that project is on hold until we set up a new mechanism for collecting and posting additional data. We'll take corrections to existing information. This is the information he collected:

Crank Make

Crank Model

Single-Double-Triple

Spindle/BB Code and Size

Spec or Measurement

Tapered square or splined?

Items above in red are essential. If you can't supply all 5 of these bits of info, don't bother submitting. If you can fill in any of the additional items below, it will make your submission more useful

Chainline

Chainring Clearance

Right Crank clearance

Left Crank clearance

Tread (a.k.a. "Q factor")

Bolt Circle Diameter

Accuracy

Japanese Bottom Bracket Spindles, Traditional Cup And Cone Type

Note: India's standard copies this and lists more spindles. See listing in PDF document

Avocet - See Ofmega

Bontrager (Truvativ)

Bulletproof

Campagnolo

Coda

Mavic

Ofmega (Avocet)

Ritchey (Sugino)

Shimano Cartridge Bottom Brackets

Note: Octalink ® V1 and V2 splined bottom brackets are very similar looking but if you use the wrong version you will ruin your crank! If in doubt, measure.

Shimano Cranksets

Sakae Ringyo (SR)

Stronglight

Sugino

Sun Tour

T.A. Cyclotouriste (Generally interchangeable with older Stronglight)

Thorn

Truvativ

Chainline Measurement

Axle/Crank Interfaces

Square Taper

ISO vs J.I.S. Standard

ISIS Drive Spline

Bottom Bracket Threading

What happens if you try to mix different sizes:

Chainline

Thanks to those who helped by providing data points for this survey:

For more info on Campagnolo and Shimano Models, see Martin Trautman's site

Articles by Sheldon Brown and Others

Copyright © 1997, 2008 Sheldon Brown

Harris Cyclery Home Page

Items above in red are essential. If you can't supply all 5 of these bits of info, don't bother submitting.
If you can fill in any of the additional items below, it will make your submission more useful