KMC chains are very slim designs. In addition to a lower weight, this design convinces by very quiet running and less chain suck. The 10-speed chains are only 6 mm wide, of the narrowest in its class, and forgive also times when the rear derailleur is not 100% precisely adjusted. KMC’s X10-series is 100% compatible with all 10-speed derailleur systems and gives exceptional performance even to the most demanding riders.