I picked myself up a 10 speed SLX triple crankset, but am planning on taking off the large chainring and running it as a 22-32 double + bash. I was originally going to get a 10sp triple front derailleur and setting the top limit screw in, but now I am curious about the XT-M786, which is the XT FD for doubles. The specs for this FD say:
44-38 tooth outer ring compatible, total capacity 14 teeth
Since my outer chainring will only 32t, it seems that while this double FD might work, there might not really be any advantage at all, since its designed for a much large outer chainring than what I intend to use.
Then there is the complication of the shifters. Is there even such a thing as indexed shifters for doubles? (And are actuation ratios for these FDs/shifters all the same?) After thinking about it for a while, I think I might just go with the standard 3x10 front derailleur and standard triple shifter, and set the limit screw in, just to be safe because I know this will work. But I can't help but wonder about what the double FD would be like.
Thanks for the help. I tried searching for answers, but I'm still not 100% clear about this particular FD.
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