The SRAM RED AXS™ power meter breaks with tradition — and breaks through to new levels of performance. The power meters are designed with Quarq’s premier DZero™ power measurement technology fully integrated into the crankset. Welcome to the pinnacle of the power meter.These power meter spiders are to upgrade your current non-power AXS™ crankset.Key Features:All 2x, 48 and 50t variants have fully integrated power into a direct mount aero chainring,Unique chainring shape results in a lighter weight, stiffer, more durable crankset,Integrated chainring design significantly reduces weight,36-46t variants have spider-based power,Chainrings can be easily changed without requiring recalibration of the power meter,Power readings are accurate within +/-1.5% and aren’t affected by climate conditions during a ride,Power balance measures left and right legs separately,SRAM X-SYNC™ wide-tooth, narrow-tooth chainring technology provides maximum chain control,Laser-etched chainring finish is more durable,DUB™ bottom bracket adds durability, simplicity and broad compatibility,AXS™ enabled for easy monitoring and firmware upgrades,Bluetooth Low Energy and ANT+ compatible,Uses a common CR2032 battery that last for 200 riding hours and changes without tools,Power-upgrade compatible with the following RED® and Force eTap AXS™ cranksets: RED 1x: 36T-46T, Force 1x: 36T-46T, Force 2x: 33/46, 35/48.