The K-Edge provides a valuable service at a cost of just 10 grams. Do away with chain drop forever and shift with confidence during competitive events. 6061 T6 aluminum Intended for road bikes. (A cyclocross-specific model is coming soon) Prevents frame damage from a dropped chain Includes all mounting hardware for Shimano, SRAM and Campagnolo front derailleurs, including a new radius washer with secure mounting interface Works only with braze-on front derailleurs. (if your bike requires a clamp-on style derailleur, you can use a braze-on derailleur, plus the K-Edge, in tandem with a braze-to-clamp adapter) | K-Edge | Chain Catcher Black