LiveTraining, Ant+ and bluetooth compatible tire drive indoor trainer Double thread roller pressure adjust knob for long life and worry free adjustments Generates 472 Watt power at 40 km/h 35% wider resistance range than standard Mag series - 7 levels of resistance Compatible with 24` through 700x45 tires Fits hub width between 125 - 145mm Quick release remote shifter Stable 35mm diameter leg Tire Drive 24 - 29 x 1.75` 7 levels Black