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.Includes: 2 Climbing Blocks, Trainer Mat, Bike Thong and RealRides Race Day DVDSelf-cooling mechanisms, including a patented fan design, keeping the unit performing better and longerFits 26", 27", 700c, and 29 x 2.25" or 20 - 24" with optional adapter (WT7026) sold separatelyPowerTuned larger flywheel for improved road-like feelIncludes RealRides Race Day DVD training videoInfinite resistance curvePower output easily varies from less than 20 watts to over 725 watts (at an attainable 22.5 mph)64-68 decibels measured at 36" 20 mphLifetime warranty|Item SpecificationsResistanceFluid