The Saris Fluid2 Smart Equipped Bike Trainer combines the best of two worlds, for a killer training combo! This trainer is the combination of a speed sensor with the #1 selling bike trainer in the USA, to create 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.It couldn't be easier to use, simply install the magnetless speed sensor on the rear wheel of your bike, mount your bike to the solid Fluid2 trainer with Saris' innovative clutch knob, connect to your indoor cycling app of choice via Bluetooth or ANT+ and voila! you're ready to sweat.