SRAM 46T DM X-SYNC RIVAL E1 BLACK (P)Light, stiff, and durable direct mount chainrings let you pick the exact gearing you want and quickly swap sizes X Range gearing technology gives you more range and a smoother gear progression, so youre always in the right gear X SYNC wide tooth, narrow tooth chainring technology provides maximum chain control Improved aerodynamics for time trial and triathlon Laser etched chainring finish is more durable