Shifting performance durability and easy mounting are other key words for kmc chain and they are compatible with all major shifting systems warranty the life of all kmc double x durability and triple x durability chains are guaranteed to last longer than other brands double x durability warranty includes all x sl x el x10e x9e x101 and x1 models if you are not satisfied with the durability of your chain send and email to doublexkmcchainnl should you have a valid complaint you will r