Accessories Bicycles Parts Specials Tools View Cart

Visit our harriscyclery.net Catalog for a more Contemporary Shopping Experience.

Bottom Bracket Parts from Harris Cyclery

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

Shimano   |   French   |   Italian   |   Track  

Bottom Brackets

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

divider

 

Phil Wood Bottom Brackets

image

Sealed Cartridge Bottom Brackets made in USA!

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

divider

 

Shimano Square Taper Bottom Brackets

(BB-UN55 feature sealed cartridge bearings) Square Taper

Shimano BB-UN55 English thread, 68 mm width    $25.95 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.

Square Taper  

Shimano BB-UN55 Italian 70mm width $25.95 buy button

This style fits most Italian-made frames (not including newer Bianchis). Spindle taper is J.I.S.

Cup threading is 36mm x 24 TPI.

Specify spindle length: 107, 113, 115 & 118mm


divider

 

Square Taper BBs in Track Length (103mm)

IRD 68 x 103 mm Bottom Bracket BB102  $29.95  buy button

  • Made in Japan by Tange
  • CroMoly J.I.S. square taper spindle
  • BB Shell Width: 68 mm
  • Spindle Square Taper: 103 mm
  • Steel Cups
  • Sealed cartridge bearings
  • BB Thread Type: English

    NOTE: The 103mm axle is only needed for true track frames.

  • IRD 103 mm Sealed Cartridge Bottom Bracket


    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

    Phil Wood has French-thread retaining rings for their bottom brackets.

    Swiss Thread bottom bracket parts are on our French Cranks page

    Phil Wood has Swiss-thread retaining rings for their bottom brackets.

     
    divider

    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!

    divider  

    Crank Fixing Bolts

    Various Mfrs.

    Self-extracting Crank Bolts

    These fit all traditional square tapered bottom brackets.

    CK029 14.95 buy button

    FSA Self-extracting Crank Bolts
    Various Mfrs.

    M8 Capless Steel Crank Bolts

    These fit all traditional square tapered bottom brackets.

    CK028 $5.95 buy button

    Use a long-handled 8 MM Allen wrench.

    Truvativ Crank Bolts
    Crank Fixing bolts from Quality Bicycle Products

    divider
     

    Crank Cotters

    See also my article on servicing cottered cranks.

    CK095
    (English)
    9.5 mm (3/8") Crank Cotters
    $1.95 Each 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
    $3.50 Each buy button
    This size fits most French bikes.
    divider

    For Parts for American-style frames that use one-piece cranks, click here!

    divider

    This site also features many
    useful articles by Sheldon Brown
    and others
    .

    Articles by Sheldon Brown and others
    Harris
    Home
    Beginners Brakes Commuting
    Lights
    Cycle-
    Computers
    Do-It-
    Yourself
    Essays
    Family
    Cycling
    Fixed Gear
    Singlespeed
    Frames Gears &
    Drivetrain
    Bicycle
    Humor
    Bicycle
    Glossary
    Bicycle
    Links
    Old
    Bikes
    Repair
    Tips
    Tandems Touring What's
    New
    Wheels Sheldon
    Brown
    divider

    URL: http://harriscyclery.com/bottombrackets

    Copyright 2005, 2007, 2010, 2011, 2012, 2013, 2015 Harris Cyclery