dslfoolish

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. I am not quite sure what front derailleur I should be looking at. I was initially set on getting the XT-M786, which is the XT FD for doubles, but the specs say:

44-38 tooth outer ring compatible, total capacity 14 teeth

Since my outer chainring will only 32t, it seems this FD might not work so well, as it was designed for a much larger outer chainring.

Does anyone know what shimano FD I should be purchasing, given than I am running a 22-32 up front and 10sp in the rear? Should I be buying a triple FD and then setting the limit screw in? If so, would I be getting double or triple shifters?

Thanks for the help. I tried searching for answers, but I'm still not 100% clear.

Kimmo

First, why on Earth would you want to lose the big ring? 44 isn't very big anyway, let alone 32.

But if you do have some good reason to this crazy-sounding thing, you need to use a triple FD. I suppose you could turn the big ring into a chainguard. A BB spindle that's longer by the distance between the chainrings will correct the chainline. Either double or triple shifters should work, provided they're compatible with the FD's actuation ratio.

cny-bikeman

That is a bit strange - perhaps cyclocross? Half the distance between rings would be sufficient, or you could just leave as-is if budget is a problem.

rdtompki

Still, if that's what you want to do the FD should work. I've got a daVinci tandem with four chainrings (30,24,18,12) and standard triple FDs work. Some may work better than others, but if you're only shifting a double, albeit a strange double, you'll find one that works just fine.