JetBlack V2 Smart Trainer Compatibility Wheel Sizes :Compatible with 650c, 700c, 24″, 26″, 27.5″, 29″, Road and MTB wheels Axles:Compatible with 130 mm and 135 mm quick release, 12×142 mm and 12×148 mm thru axles Freehub body : Hyperglide Cassette:11 speed Shimano/Sram cassette. VOLT™ is compatible with XD-R but a XD-R freehub body is purchased separately The VOLT™ V2 is the best value for money trainer to unlock your potential and power your performance. The VOLT™ V2 Smart Indoor Cycle Trainer comes pre-assembled with an 11 speed cassette making it super easy to start riding. There are no added costs. The Volt™ V2 is extremely quiet and provides an exceptional riding experience. Designed to seamlessly connect with most popular training platforms. Attach your bike, CONNECT & GO. Volt is the same smart trainer as Zwift Hub smart trainer Immerse Yourself In A Whole New Level Of Indoor Training Tech Specs +/-2% : Accuracy 1800W : Max Watts 16% : Max Gradient simulation App Controlled : Resistance 4.7kg : Flywheel Weight