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Bottom Bracket Types

Repair & Tech Info - Bikeman Tech Info

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Bottom Bracket Types
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There are many different types of bottom brackets available right now. From the old style ’square tapered’ spindles, external bearing bottom brackets, and press in bottom brackets, Bikeman has written up a brief description / explanation of the different styles here.

 

Contents:

Page 1 - External Thread-In Bottom Brackets (Hollowtech II, GXP, X-Type...)

Page 2 - Internal Bottom Brackets (square taper, Octalink, ISIS...)

Page 3 - Internal Press-In Bottom Brackets (BB30, BB86, BB92...)

 

 

External Thread-In Bottom Brackets:

Bearings Housed On Outside of Bottom Bracket Shell

 


TruVativ GXP

 

 

TruVativ Giga X Pipe, or "GXP" - Shop For Them Here
TruVativ crank design with a 24 to 22mm tapered spindle attached to the right (drive side) crank arm. Bottom bracket cups thread into the frame and house the bearings outside of the shell.

NOT COMPATIBLE WITH SHIMANO STYLE BOTTOM BRACKETS/CRANKS (because of taper)

 

 

 

 


TruVativ Howitzer

 

 

 

TruVativ Howitzer - Shop For Them Here
TruVativ design required for 2006 Holzfeller and Howitzer crank models - FITS NO OTHERS. 10 spline 21mm spindle and extra large cartridge bearings housed outside of the shell.

 

 

 

 

 


Shimano Hollowtech II

 

 

 

Shimano Hollowtech II - Shop For Them Here
Shimano crank design with a 24mm spindle attached to the right crank arm. Bottom bracket cups thread into the frame and house the bearings outside of the shell.

 

 

 

 

 


FSA MegaExo Light

FSA MegaExo

 

 

 

FSA Mega Exo Integrated - Shop For Them Here
FSA crank design with a 24mm spindle attached to the right crank arm. Bottom bracket cups thread into the frame and house the bearings outside of the shell. As you can see to the left, there are a few bearing variations of Mega Exo; Light, Regular, and Quad. Each works with specific cranks. See a complete FSA external bottom bracket / crank set compatibility chart here:
FSA Bottom Bracket Compatibility / PDF File (500kb)

 

 

 

FSA MegaExo Quad

 

 

 

 

 

 

 

 

 

 

 


FSA MegaExo 19

 

 

FSA Mega Exo 19 - Shop For Them Here
FSA crank design with a 19mm spindle attached to the right crank arm. Bottom bracket cups thread into the frame and house the bearings outside of the shell. See a complete FSA external bottom bracket / crank set compatibility chart here:
FSA Bottom Bracket Compatibility / PDF File (500kb)

 

 

 

 

 


Race Face X Type

 

 

 

Race Face X-Type - Shop For Them Here
Race Face crank design with a 24mm spindle attached to the left crank arm. Bottom bracket cups thread into the frame and house the bearings outside of the shell.

 

 

 

 

 

 


FSA Platinum MegaExo ISIS
FSA ISIS design that is compatible with ISIS style cranks but places bearings on outside of shell.



Internal Bottom Brackets on next page...