Sram: When SRAM re-introduced SRAM RED in 2012 there was simply nothing more they could add to make it better. SRAM RED was all new, redesigned throughout, with innovations they've spent the past year touting and their athletes proving. It was loaded with features and benefits that matched the needs of professionals: fast, light, aerodynamic, ergonomic, near-silent, and, of course, trim-less, with ground breaking Yaw technology. Adding two more gears to that combination was arguably the only improvement required. The added benefit is that now, without adding weight, we maintain a system that shifts incredibly fast upfront, and with the best and smoothest gear transitions in back. And, for the first time available anywhere, the system gives you twenty-two gears. No compromise and no trim, what we're calling True 22, in any gear combination. Welcome to SRAM RED 22.Replacement chain rings in 110mm and 130mm BCD for SRAM 11 YAW speed road cranks. Replace worn out rings or swap to change gearing for specific uses.