KMC chains have special design features which support the performance of the shifting systems in the best possible way. By adapting the tooth profiles to the chain construction, the clearance between the sprocket and the chain is minimized - thereby increasing the efficiency of the drive while reducing wear. The degrees of hardness of the chain and sprocket are also matched to each other and the lifespan of the drive components is thus significantly extended. The best example of the performance of this concept is the 10,000km+ components: A mileage of at least 10,000 km is guaranteed by KMC.