In The Box:Fluid2 Bike TrainerDual-band magnetless speed sensorLeveling blockTech Specs:Noise level: 69 decibels at 20 mphResistance Unit: Fluid, creates a quiet and consistent rideResistance Curve: Progressive, provides widest resistance range and road-like feelSensors: External, magnetless speed or cadence sensor includedMaximum Weight (rider and bike): 300 lb.Design:Wheel-On: Connects to rear wheel of bike, no need to remove wheel or disassemble bikeTrainer Frame: Foldable Classic frame with spring loaded, bolt-action leverResistance Knob: Clutch knob, clicks like a gas cap to indicate correct roller-to-tire tensionRoller: Alloy, precision-machined alloy resistance roller reduces tire wear and slippageLeveling Feet: Yes, for easy adjustment on uneven surfacesCooling System: External, self-cooling mechanisms, including patented fan design, keep unit performing better, longerThru Axle Adapter: Sold separately for 142x12mm and 148x12mm bikesFlywheel: Precision-balanced to create road-like feelConnectivity:Compatible with indoor cycling appsBike Compatibility:Steel quick release skewer included for common road and mountain bike framesThru Axle Adapter: Sold separately for 142x12mm and 148x12mm bikesThree settings for rear dropout spacing: 120mm130mm135mm2" resistance unit roller compatible with the following wheels and tire widths: 650b700c27 ... More info