A Killer Training Combo. What happens when you pair a speed sensor with the #1 selling bike trainer in the USA? You get a combo that's ready for any virtual – or non-virtual – training ride. It's the ideal setup for budget-conscious athletes looking to join fun, virtual communities, like Rouvy and Zwift, without a traditional smart trainer. Simply install the magnetless speed sensor on the rear wheel of your bike, mount your bike to the solid Fluid² trainer with our innovative clutch knob, connect to your indoor cycling app of choice via Bluetooth or ANT+ and voilà! - you're ready to sweat. Product Features: - Fluid resistance unit provides a quiet and consistent ride. - Progressive resistance offers the widest resistance range and road-like feel. - Included speed sensor connects you with Rouvy, Zwift and other compatible indoor cycling apps. - ANT+ USB and BlueGiga USB sold separately. - Includes one-month subscription to Rouvy virtual training app Product Specifications: - Speed sensor included - Compatible with MTB and road bikes, of wheel sizes up to 2.1 inches. - Compatible with MTB with thru axles, adaptors for thru axles are sold seperately.