RaceFace Bosch G4 Direct Mount Hyperglide+ eMTB Chainring 52mm Chainline - 36t Steel Requires Shimano 12-speed HG+ Chain BLKRaceFace Bosch G4 Direct Mount Hyperglide+ eMTB Chainring (52mm Chainline) 36t Steel Requires Shimano 12 speed HG+ Chain Black. The RaceFace Bosch Gen4 Hyperglide+ steel chainring mounts directly to Bosch Gen 4 Performance Line CX E bike motors offering a minimalist look and long wearing performance. Only compatible with Hyperglide + chains and Bosch Gen 4 Performance Line CX motor Designed for use with 12 speed Shimano drivetrains Narrow Wide tooth