Thread: Component help
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Old 06-26-20, 05:18 AM
  #16  
djb
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Originally Posted by AeroGut View Post
Sorry about the confusion. I am indeed using a 9-speed Tiagra, which is relatively new to me. I also have the same setup on an 8-speed Sora. Both are 130/74 BCD. However, the Shimano info on the Tiagra 10-speed triple says the inner BCD is still 74, but the outer is now 110. The big difference on the inner is the switch to 4-bolt instead of 5. It may be that appropriate 4-bolt chainrings smaller than 30 are not available?
In any case, 3x9 can be set up with a very wide range.
It's been a while since I read about the bcd change, so am not 100% sure now. But yup, I've done the change to 26 on two bikes both with fsa cranks, s and the fd"'s handled it fine as is and the 13t jump is fine also to live with, for me anyway.
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