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I have 8 speed 105 set up on my bike and was thinking of trying out some compact cranks such as the FSA energy. The info on the cranks say 9/10 speed compatible, does it really matter other than changing the bb? any help is appreciated!
tele
 

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Old, slow, and fat.
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tele said:
I have 8 speed 105 set up on my bike and was thinking of trying out some compact cranks such as the FSA energy. The info on the cranks say 9/10 speed compatible, does it really matter other than changing the bb? any help is appreciated!
tele
Even better: XTR and a 110mm spider. Much mo bettah

M
 

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chain/chainring/cassette compatibility

tele said:
Anyone else have any ideas?
Cranks are fairly agnostic when it comes to 8/9/10spd, so it is likely that 9/10spd cranks would work with an 8spd drivetrain. But in the worst case, Shimano 9spd chains are compatible with 8spd drivetrains, so you could always use a 9spd chain with an 8spd cassette and 9/10spd cranks
 

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Agree with Mark McM

The 9 speed chainrings should work find with 8 speed. Not too much difference there. You might have a little more of a clearance issue with the more extreme gears, but I have used this on my kid's bikes without issue.

Before rings were called "9/10" most used to be called "8/9".

Go for it.
 
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