Indexed thumb shifter puts a maximum range of resistance at your finger tips * Ultra-quiet and the same frame and wide-diameter roller as Road Machine Trainer * 6.25lb (2.8kg) flywheel - the largest in the industry - gives a smooth, realistic ride * Magnetic resistance unit is interchangeable with ANY Kinetic frame * The perfect trainer for: Mountain, cyclocross, BMX bikes, single-speed bikes and other bikes with lower gearing