Bottom Bracket Compatibility

[Clinton - theCOW]

Hi

 

 

 

Anybody out there know if you can use a SRAM Force Crank on Shimano Ultegra BB?

 

 

 

Have manufacturers "standardised" BB to Crank sizes?

 

 

 

Thanks

[techguy]

No you can't, Sram is competition to Shimano so they've made a different system so they don't have to pay licencing fees to Shimano for their system.

 

Race Face, FSA, and a couple of others are compatible tho. they mostly use a 24mm axle diameter, just watch out with FSA as some f their BB's are "thinner" than the Shimano ones so there may be sideways play in the crank or they'll be too tight due to too much preload.

[Johan Bornman]

No you can't' date=' Sram is competition to Shimano so they've made a different system so they don't have to pay licencing fees to Shimano for their system.

 

Race Face, FSA, and a couple of others are compatible tho. they mostly use a 24mm axle diameter, just watch out with FSA as some f their BB's are "thinner" than the Shimano ones so there may be sideways play in the crank or they'll be too tight due to too much preload.

[/quote']

 

When you say "thinner", do you mean the axle's diameter is smaller or the over end dimensions are smaller leaving the axle too long if you fit the wrong crank?

 

 

[dirtrider]

I think he means the od . a longer crank should not really be a problem .

[techguy]

I mean the thickness of the actual cups that sit on the outside of the frame, I've measured a millimetre difference between a Shimano BB (assembled on the frame) and an FSA BB.

 

Leaving the crank axle "too long" when fitted.