The JetBlack Z1 PRO Fluid is a high quality, fluid resistance bicycle trainer. Fluid resistance trainers provide a more road-like' feel than magnetic trainers and this feel is increased by a higher weight flywheel. The JetBlack Z1 PRO Fluid has one of the heaviest flywheels on the market and has the longest run down time in its class. The proprietary fluid in the JetBlack Z1 PRO Fluid increases resistance exponentially, the faster you spin the harder it gets. Correct use of your bicycle's gears will allow you to fine tune any training session without having to manually adjust resistance. When used with the full range of JetBlack sensors, you can enjoy training sessions identical to those used by professional cycling teams. The JetBlack Z1 PRO Fluid is an award winning trainer and like all JetBlack trainers, comes with a lifetime warranty. award winning trainer and like all JetBlack trainers, comes with a lifetime warranty Folds into compact shape for easy storage and transport. Lowest profile of any trainer Multiple coaching sessions crafted by Olympic cycle coach Murray Healey Test and monitor yourself with an in built Fitness/Zone test and Training Zone calculator Upload your workout to Training Peaks and Strava