Included speed sensor allows you to track speed and distance and train with your favorite apps (requires app downloaded on your tablet, phone or laptop paired to speed sensor) — such as the Tacx Training app and TrainerRoad - Suitable Axles : Width of rear fork: Race 130 mm, MTB 135 mm. Adapters for other widths available. Powerful magnetic brake means you get the most out of your indoor rides Manually control resistance with a lever placed on the handlebar of the bike; 10 resistance levels, up to 1050 watts With just two simple clicks, easily set up your bike into the robust and stable trainer Experience a realistic ride feel generated by an actual flywheel (1.65 kg or 3.64 lbs)