K-EDGE 1x Race Chain Guide - For Single Chainring Braze-on BlackK EDGE 1x Race Chain Guide For Single Chainring Braze on Black. The K Edge 1x Race Chain Guide is designed for chain retention under the most abusive conditions. It has been tested for all 1x drive train application including gravel cyclocross mountain and road. Optimized for 36T to 52T Chain Rings Braze on mount and braze on adapter clamp compatible Fully adjustable for height center line and angle Optimized for 11 and 12 speed drivetrains CNC