The CycleOps Fluid Trainers fit a wide variety of wheel sizes. Designed with Power Band technology, it allows resistance levels to vary with cadence or gear shifts. The cooling mechanism increases the life of the resistance unit. Fits 26", 27" and 700c or 20"/24" with optional adapter (WT7025). Quick-lock bike mount lever on all trainer frames. All include a CTS training video, except Fluid TT. Custom bike skewer provided. Power output easily varies from less than 20 watts to over 725 watts (at an attainable 22.5 mph). Cooling mechanism increases the life of the resistance unit. Team Cyclist is an authorized Cycleops dealer and will honor all manufacturer warranties.