The JetBlack Z1 PRO Fluid is a high quality, fluid resistance bicycle trainer. The Z1Pro trainer provides a more \\\'road-like\\\' feel than magnetic trainers, this feel is increased by a higher weight flywheel, leading to longer coast down times. The proprietary fluid in the JetBlack Z1 PRO Fluid increases resistance exponentially, the faster you spin the harder it gets. When used with the full range of JetBlack sensors, you can enjoy training sessions identical to those used by professional cycling teams. WHAT\\\'S INCLUDED: QR Skewer JETBLACK Cycling App Specifications: Size: 610 (L) x 555 (W) x 410 (H) mm 24 x 21.8 x 16.1 inches Size after folding: 610 (L) x 475 (W) x 170 (H) mm 24 x 18.7 x 6.7 inches Total Weight: 13.87kgs/37.2lbs Resistance System: Fluid Resistance Levels: Progressive road-like feel Watts: 900 at 60Km/h Roller Material: HydroGel Flywheel Weight: 3kgs/6.6lbs Coast down time: 14+ seconds Axle Compatibility: 130mm, 135mm (QR and Boltup) 12mm x 142mm with trainer axles. Will suit most bikes with axle width 120mm and 150mm Wheel Size Compatibility: 26\\\", 27.5\\\", 29er, 700c Some 24\\\" bikes