The K-EDGE Elevate Race Chain Guide design gives full coverage protection and automatic chain reseating while removing the risk of chain binding on the backpedal. The updated design reduces weight by 26%, is more aero, and easier to install. Designed for greater compatibility with 11, 12, and 13-speed drivetrains and larger cassettes. K-EDGE&';s Opposing Locking System 2.0 let&';s you set it and forget it, for a lifetime of zero dropped chains. Made In USA with Lifetime Warranty Chainring Range: 40t - 52t (Dependent on distance from braze-on to bottom bracket axis) Designed to allow the derailed chain to ride above the front chainring teeth, avoiding the risk and force of binding during a derailed backpedal Automatically reseats the chain on the chainring upon forward pedaling to take out the most dangerous effects of a derailed chain in the 1x system, leaving the rider to simply focus on the ride K-EDGE Opposing Locking System 2.0 offers three easily accessible screws to infinitely adjust and lock in the chain guide into position Full aluminum cage design protects inside and outside chain drops Item Specifications Chainguide Mount Type Braze-on Color Black/Silver Defined Color Black Defined Color Silver Material Aluminum Max Tooth (teeth) 52 Weight 39.6 K-Edge Elevate Race 1x Chain Guide Chain Retention System UPC: 850071374926