A question here fam. I want to change the outer plate from 42t to 48t. What BCD is this crankset? It’s Shimano FC MC 18
by Few_Mechanic5050
A question here fam. I want to change the outer plate from 42t to 48t. What BCD is this crankset? It’s Shimano FC MC 18
by Few_Mechanic5050
5 Comments
Can your front derailleur move up any more to accommodate the change?
It’s a MTB so 104 bcd
94 bcd, 4 bolt. A quick Google search of the FD part number and “capacity” will give you a number like “18t”. That’s the rating for how much difference between smallest and largest chainring the derailleur can handle. A competent mechanic can usuall exceed that by a little bit, but the setup has to be more precise, and is easier with a friction shifter than indexed
You’ll need a new crank
LBS has a gauge to measure this. personally, i’d go that route & maybe have them order whatcha like. of course, you can install it yourself. the front derailleur mount has room to move up to accommodate?