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.