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Bottom Bracket Parts from Harris Cyclery

Bearing
Balls		 Bolts Cotters Cups only One Piece/
American
Square Taper Bottom Bracket Sets:

Shimano   |   French   |   Track  

Bottom Brackets

BB threading: British? Italian? French? Click here!     A partial list of cranksets and their recommended BB size.

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Shimano Square Taper Bottom Brackets

(BB-UN55 feature sealed cartridge bearings) Square Taper

Shimano BB-UN300 English thread, 68 mm width    buy button

Specify spindle length: 107, 110, 113, 115, 118, 122.5, 127.5 mm

This style fits almost all frames not made in France or Italy. Spindle taper is J.I.S.


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Square Taper BBs in Track Length (103mm)

Sunlite 68 x 103 mm Bottom Bracket BB106  buy button

  • J.I.S. square taper spindle
  • BB Shell Width: 68 mm
  • Spindle Square Taper: 103 mm
  • Alloy Cups
  • Sealed cartridge bearings
  • BB Thread Type: English

    NOTE: The 103mm axle is only needed for true track frames or older road frames with 120mm dropout spacing.

    		• Sunlite 103 mm Sealed Cartridge Bottom Bracket



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    Phil Wood Bottom Brackets

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    Sealed Cartridge Bottom Brackets made in USA!

    We no longer sell Phil Wood products.
    Please visit their website: www.philwood.com

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    Bottom Bracket Dimensions (See also my Bottom Bracket Size Article and Bottom Bracket Cribsheet)

    Standard:ThreadingAdjustable
    (left) cup
    direction    		Fixed
    (right) cup
    direction    		Shell
    Width    		Applications/Notes
    British
    I.S.O.    		1.370" X 24 tpi
    1.375" X 24 tpi    		rightleftStandard 68 mm
    O.S. 73 mm    		The overwhelming majority of bicycles in current production.
    British and I.S.O. are interchangeable.
    ISIS Overdrive48 x 1.5 mmrightleft68mm
    100 mm    		New proposed standard oversized system.
    Italian36 mm X 24 tpirightright
    (wrong!)    		70 mmItalian and some high-end French bicycles.
    Prone to problems due to the right threaded fixed cup,
    which tends to unscrew itself in use.
    French35 mm X 1mm (25.4 tpi)rightright
    (wrong!)    		68 mmObsolete, used on older French bicycles.
    Prone to problems due to the right threaded fixed cup,
    which tends to unscrew itself in use.
    Swiss35 mm X 1mm (25.4 tpi)rightleft68 mmSame thread as French, but fixed cup is left threaded for reliability.
    Raleigh1 3/8" X 26 tpirightleft71mm
    76 mm    		Older British-made Raleighs, especially 3 speeds.
    O.P.C.
    Ashtabula    		Male threads
    on crank
    24 tpi (most)
    28 tpi
    (Schwinn,
    Mongoose)
    68 mm (2.68") wide
    51.3 mm (2.02") i.d.
    (approximate)    		Older U.S. bikes, BMX, Juvenile bikes,
    Department store bikes.
    24 tpi cranks use #66 retainers, with 10 5/16" balls. Note: Some higher quality(mostly BMX) bikes used Tange 24 tpi BBs with #64 retainers.
    28 tpi cranks use #64 retainers, with 9 5/16" balls.
     

    French Thread bottom bracket parts are on our French Cranks page

     
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    Grade 25 1/4" Balls bag of 25 buy button

    Virtually all traditional bottom brackets use 11 1/4" balls on each side. These are the highest quality, grade 25. Many shops use the cheaper grade 100 or even grade 300, but we feel that at this price anybody can afford the best.

    Using indivual loose balls is gives better results than balls in retainers, so we don't carry retainers for this application. The primary advantage of using retainers is slightly faster assembly at the factory, and also the opportunity to use fewer balls.

    The 1/4" size also fits most rear hubs, 9 per side, so you might want to stock up.

    See also our Bearings Page

    Don't forget to use plenty of grease!

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    Crank Fixing Bolts

    Various Mfrs.

    M8 Capless Steel Crank Bolts

    These fit all traditional square tapered bottom brackets.

    CK028 buy button

    Use a long-handled 8 MM Allen wrench.

    		Truvativ Crank Bolts

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    Crank Cotters

    See also my article on servicing cottered cranks.

    CK095
    (English)    		9.5 mm (3/8") Crank Cotters
    buy button    		This size fits Raleighs and other English bikes, also fits most Asian made cottered cranks. DESCRIPTION
    (You will probably need to file the flat down some to fit your cranks)
    CK090
    (French)    		9.0 mm (French Size) Crank Cotters
    buy button    		This size fits most French bikes.
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    For Parts for American-style frames that use one-piece cranks, click here!

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