joewein
Maximum Pace
- Oct 25, 2011
- 3,532
- 3,693
And you would have to go mountain shifters instead of brifters because the cable pull is different.
True for 10sp MTB derailleurs, but 9sp MTB rear derailleurs are compatible with STI shifters.
A 9sp MTB rear derailleur works fine with a 10sp cassette, chain and STI shifter.