Minoura RDA-800 Rim Drive Trainer " Red 5 Levels. * Rim Drive clamps to the braking surface on rims for consistent and smooth grip, great for knobby tires, upgraded model with a 0.8 kg steel flywheel, 8kg, 100kg capacity. * Great stability with fold down legs for easy storage, double sided axle clamp with crank style tensioner and right side centering adjustment, fits 100-145mm OLD, micro adjust roller pressure. * Quiet magnetic resistance with 5 settings adjustable by a dial knob on the resistance unit, 26" - 700c wheel range. * Will not work on disc specific rims, requires min, 8mm brake surface.