SRAM Rival E1 2x12 ChainringSRAM Rival E1 2x12 Chainring: Precision, Durability, and Efficiency SRAM wanted light weight, stiffness, and durability, and we got all three. The Rival 2x chainring kit is a single integrated unit so no effort is wasted, transferring all your power to the pedals. Key Features: Crisp and accurate front shifts One piece construction for faster, smoother, more secure shifting X Range gearing technology gives you more range and a smoother gear