Originally Posted by
AMoney
It's good to know that the 11 speed crank is compatible with a 10 speed drivetrain. Out of curiosity, would a 10 speed crank be compatible with a 9 speed drivetrain?
It will work fine. The crankset doesn't care how many speeds are on your cassette. Granted the chain is different for these, but the difference is too small to make a difference. I just put a 12-speed crankset on an 11-speed drivetrain and it still shifts flawlessly.