The JetBlack S1 Sports trainer is a magnetic resistance trainer that can be used to sub out rides in unfavourable conditions.The S1 is an economy package that features a basic, fixed resistance mode tuned to best develop your fitness riding. You will be able to fine tune your personal preferences and even use the included Lite App to upload your session to Strava and much more.WHAT’S INCLUDED:– QR Skewer– JETBLACK CYCLING APPAxle Compatibility: 130mm, 135mm (QR and Boltup) 12mm x 142mm with trainer axles. Will suit most bikes with axle width 120mm and 150mmWheel Size Compatibility: 26", 27.5", 29er, 700c Some 24" bikes