A Killer Training Combo. The SARIS Bike Trainers for Indoor Riding is a high-quality smart bike trainer that is perfect for cyclists of all levels. It features a fluid resistance unit that provides a quiet and consistent ride, as well as a progressive resistance curve that offers the widest range of resistance and road-like feel. The bicycle trainer (9907T) also includes a speed sensor that connects to Rouvy, Zwift and other indoor cycling apps. With this smart trainer, you get a combo that's ready for any virtual - or non-virtual - training ride. Simply install the magnet-less speed sensor on the rear wheel of your bike, mount your bike to the solid Fluid smart bicycle trainer with our innovative clutch knob, connect to your indoor cycling app of choice via Bluetooth or ANT+, and voil! - you're ready to sweat.