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Bottom bracket question...FSA vs Shimano

Old 10-06-14, 02:30 PM
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Bottom bracket question...FSA vs Shimano

Hi there..first post so please go gentle on me...!

I have a 2008 Specialized Roubaille Elite which has a FSA Gossamer crank set. I'm looking to replace that with a Shimano 105 Hollowtech II.

My question is whether - when i take the FSA off - I will be able to simply put the Shimano on the existing bottom bracket, or whether I will need to replace that BB with a Shimano one?

Really appreciate any thoughts/observations....

Cheers

Stuart
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Old 10-06-14, 02:40 PM
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You Should be able to get a package deal on the Shimano crank and the right BB included . why not just do that ?

Re sell the whole FSA set as one too.
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Old 10-06-14, 03:23 PM
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Assuming the FSA BB is a modern style 24mm BB it should work. I tried swapping a Shimano and FSA crank on a mountain bike and the Shimano crank went in the FSA BB OK but the FSA crank was very tight in the Shimano BB. I finally gave up cause I was worried I'd never get the FSA crank back out. I was told in a forum that while they are both 24mm spindles, FSA allows a greater + tolerance.
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Old 10-06-14, 03:53 PM
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I don't know if they are completely compatible but Shimano HTII bottom brackets are so inexpensive, why not just get a matched set?
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Old 10-06-14, 06:27 PM
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Originally Posted by Slash5
I tried swapping a Shimano and FSA crank on a mountain bike and the Shimano crank went in the FSA BB OK but the FSA crank was very tight in the Shimano BB. I finally gave up cause I was worried I'd never get the FSA crank back out. I was told in a forum that while they are both 24mm spindles, FSA allows a greater + tolerance.
That explains why Enduro replacement bearings are a tight fight on our FSA Gossamer cranks. While it's a little bit brutal, I find a rubber mallet solves the problem, and the Enduro bearings hold up to cyclocross duty much better than the original FSA parts.

My experience is that FSA, Shimano and Raceface 24mm external BB cranks and bearings interchange easily but Shimano 105 external BB cups are cheap enough that you might as well go full Shimano and have the FSA as a full set for resale or reuse
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