I am looking at the M985 XTR crank-set and would like to do a hybrid of two gearing options to get a slightly better overall range. I was thinking of getting a crank-set with 42x30 then swapping out the 30 for a 28 small ring. I have seen some notes with the 28 tooth rings where they mention that it is for use with a 40 tooth big ring. All of these rings are 88mm bolt circle diameter, so I am wondering if there really is a limitation/compatibility issue.
Is it possible to setup an M985 XTR crank with 42x28?
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