Sram apex 1 rear mechthe sram apex 1 rear mech brings the simplicity of 1x mountain bike gearing to your road hybrid gravel cyclocross or do it all bike so you can go where you want compatible with up to a 42t cassette it will help you get over the roughest terrain and the steepest climbs also thanks to srams exact actuation x horizon technologies youll enjoy fast precise and reliable shifting features materialaluminium cage speed10 or 11 speed sram road drivetrains intended