Jet Black Whisper Drive Trainer The JetBlack Z1 PRO Fluid is an 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 Compatible with 130mm x 135mm and 12x142 Thru axle bikes Compatible with 10/11 speed cassettes; Campy and XD drivers available No Tire wear Adjustable resistance 0-1200W More accurate and repeatable resistance