Sram is not one to rest on its laurels. That's why, when it was possible to make the lightest and stiffest RED crankset even lighter, Sram went for it.The SRAM power meter is accurate to +/-1.5% and isn't affected by temperature changes, and the consistent 13-tooth gap on the rings ensures fast and reliable shiftingA new optimised layup further reduces the weight of the hollow carbon arm, and to stay ahead of current fit trends, Sram has added a first 160mm carbon crank arm length option. In addition, the X-Range gear range minimises the change in cadence when shifting forward, maximising your ability to deliver power.Features: The 2x one-piece chainring makes for a lighter, stiffer and more durable crankset. 29 g lighter than the previous generation. Power meter is fully integrated into the chainring for lighter weight. Power readings are accurate within +/-1.5% and aren't affected by climate conditions during a ride. Measures right and left leg power balance. X-Range gearing technology gives you more range and a smoother gear progression, so you're always in the right gear X-Range shifting technology gives you more range and smoother gear progression, so you're always in the right gear. Clean, precise forward movement. Ultra-light hollow carbon fibre cranks. DUB bottom bracket adds durability and simplicity. 50-37, 48-35 and 46-33T chainring combinations available. Can be fitted with a power sensor. Available in 160, 165, 167.5, 170, 172.5 and 175 mm lengths.