Originally Posted by
zacster
You could just swap the middle rings, assuming the same size. Unless the chain is maxed out on the big/big combination right now, you should be OK with 2 extra teeth. Even then, you'll be OK if you don't use the big/big since you shouldn't use it anyway.
I just found that my current crankset is 94/58 BCD 5 bolt, and the proposed replacement is 104/64 BCD 4 bolt. What do you think?
Do you think I will have to lengthen the chain?
Thanks again