CycleOps Fluid-2 Power Training Kit Kit Includes: Fluid2 Trainer, Joule 1.0, PowerCal, Speed Sensor, and Race Day DVD Large flywheel offers a road-like feel with an infinite resistance curve Self-cooling mechanisms keep the unit performing better, longer Cam-Lever tightens resistance unit with one movement Fits 26", 27" and 700c or 20"/24" with optional adapter (WT7025)