The Saris Fluid 2 Smart Equipped is ready for any virtual - or non-virtual - training ride. It's the ideal setup for athletes looking to join fun, virtual communities, like Rouvy and Zwift, without the high cost of a smart trainer. Simply install the magnetless speed sensor on the rear wheel of your bike, mount your bike to the solid Fluid 2 trainer with the innovative clutch knob, and connect your indoor cycling app of choice via Bluetooth or ANT+ (USB sold separately). 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 indoor cycling apps. * ANT+ USB and BlueGiga USB sold separately Large, individually precision-balanced flywheel allows for improved road-like feel Self-cooling mechanisms including a patented fan design keeps the unit performing better, longer Eccentric leveling feet allow for easy adjustment on uneven surfaces Fits common frames with included steel quick release skewer for 120mm, 130mm and 135mm spacing. Thru-axle adapter available for 12 x 142mm and 12 x 148mm bikes Specifications: Resistance: Fluid Adjustable Resistance: No Minimum Wheel Diameter: 20" w/ adaptor (Sold Separate)