Originally Posted by
xybaby
Thanks so much! Will the 9 speed MTB crankset work with 10 speed drivetrain?
As I said in my reply: I'm using a 10-speed Ultegra drive-train with a 9-speed MTB crank. It works very well.
Should I also change FD?
Not unless it gives you problems. In my case, the 9-speed MTB crank came with a BB and several spacers. When I installed all of the spacers as indicated in the instructions, the road FD wouldn't shift to the outermost chainring on the MTB crank. I removed one 2.5mm spacer from the drive side of the BB and then everything worked. I did have to lower the FD to match the profile of the smaller chainrings on the MTB crank and I had to adjust the limit screws so that it shifted properly.