Incline simulation up to 16% Power measurement accuracy of 2.5% Heavier 16.8 lbs flywheel improving realism Measure speed, cadence and power Compatible with long cage derailleurs Axle compatibility: 130mm, 135mm, 142x12mm and 148x12mm Compatible with Bluetooth and ANT + FE-C Comes with Shimano/SRAM compatible freehub body (Except SRAM XD and XDR). Campagnolo, SRAM XD and XDR bodies sold separately (890732 or 891051) 12mm thru-axle adaptor included T2980.60 5mm axle; T2980.60 (A) 12mm axle