There is a difference between Shimano 10 speed road and Dyna-sys MTB chains, the road chains like CN-5701 & CN-6701 are directional, for 2x10 setup, where as 3x10 use the older chains like CN-5700 & CN-6700, where as MTB uses the HG-X chain, and the chains like CN-5701 aren't compatible. http://bike.shimano.com/publish/cont...__shimano.html