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The Sairs Fluid Trainer provides a quiet and consistent ride due to its fluid resistance unit and precision balanced flywheel. Fluid unit allows resistance levels to vary with cadence or gear shifts. Fluid resistance unit provides a quiet and consistent ride. Progressive resistance offers the widest resistance range and road-like feel. Wheel-on bike trainer with Clutch Knob for perfect roller-to-tire pressure each ride. Noise level at 20 mph is super quiet 64-68 decibels. Self-cooling mechanisms including a patented fan design keeps the unit performing better longer. Compatible with quick release hubs; 120mm 130mm and 135mm. Optional thru-axle adapter available for 142x12mm and 148x12mm.