Tech Specs: Noise level: 69 decibels at 20 mph Resistance Unit: Magnetic, provides quiet frictionless ride Resistance Curve: Linear, intensity increases along set path with changes in pedaling and bike gearing Maximum Weight (rider and bike): 300 lb. Design: Wheel-On: Connects to rear wheel of bike, no need to remove wheel or disassemble bike Resistance Adjustment: Handlebar-mounted, adjustable resistance unit shifter included Trainer Frame: Foldable Classic frame with spring loaded, bolt-action lever Resistance Knob: Clutch, clicks like a gas cap to indicate correct roller-to-tire tension Roller: Alloy, precision-machined alloy resistance roller reduces tire wear and slippage Leveling Feet: Yes, for easy adjustment on uneven surfaces Cooling System: External, self-cooling mechanisms, including patented fan design, keep unit performing better, longer Thru Axle Adapter: Sold separately for 142x12mm and 148x12mm bikes Compatible with indoor cycling apps when paired with your favorite speed or cadence sensor Bike Compatibility: Steel quick release skewer included for common road and mountain bike frames Thru Axle Adapter: Sold separately for 142x12mm and 148x12mm bikes Three settings for rear dropout spacing: 120mm 130mm 135mm 2" resistance unit roller compatible with the following wheels and tire widths: 650b 700c 27.5", up to 2.0" wide 29", up to 1.5" wide and without tread The Mag+ is not compatible with the following wheel diameters and tire widths: 650c 29" with tread and/or wider than 1.5" 26" FYI: Some assembly required Trainer Tire: Recommended, not included Magnetless speed or cadence sensor sold separately Handlebar-mounted shifter sold separately Formerly branded as the CycleOps Mag+