SRAM RED/Force AXS Power Meter Spider - 107 BCD, 8-Bolt Crank Interface, 1x/2x, Black, D1The SRAM AXS Power Meter Spider can be used to upgrade your SRAM AXS crankset to a power meter. Power meters returned to QBP are subject to a 30% restocking fee, unless product and packaging are unopened, unused, free of damage, and can be sold as new 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