Minoura M20V Tire Drive Trainer (18-20-Inch) Single neodymium magnet with a quiet and smooth feel Generates 433 watts of power at 25 mph 7 resistance levels with a 35% wider resistance range than standard Mag Series Quick release remote shifter; allows for high-speed/low resistance training 24W X 12H X 11D (inches) no bullet points available on website