The SRAM AXS Power Meter Spider can be used to upgrade your SRAM AXS crankset to a power meter. FEATURES: AXS enabled for easy monitoring and firmware upgrades 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 Bluetooth Low Energy and ANT+ compatible 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 Uses a common CR2032 battery that last for 200 riding hours and changes without tools SPECS: 107 BCD 8-Bolt Crank Interface 1x/2x