SRAM RED E1 2X Chain Ring KitSRAM RED E1 2X CHAIN RING KIT Our lightest, stiffest, and most durable chainring. Our one piece construction ensures that none of your effort goes to waste. A 13 tooth delta on all chainring pairs ensures precise shifting for any setup, as well as a less dramatic change in cadence during front shifts. And the technology weve packed in makes this our longest lasting chainring set ever. SPECIFICATIONS Chainring Size 46 33T, 48 35T, 50 37T Bolt Circle