This Tacx Genius Smart interactive Turbo trainer offers the most advanced brake of all the fixed Tacx trainers, so you can enjoy a highly realistic cycling experience. The motor brake is able to apply a maximum power of 1500 W to the back wheel & will speed up during a descent. The slopes simulated are realistic up to 20% & down to -5% for descents. The Genius communicates via ANT+ & Bluetooth Smart for convenient training sessions using your smartphone or tablet. Performance data can be viewed on several devices simultaneously, including your smartphone, bike computer & sports watch. The Genius offers ease-of-use & freedom of choice. The Motor Brake The motor brake is the most advanced resistance unit providing the most realistic cycling experience. The resistance is dynamically controlled, it is constantly calculated & adjusted in order to simulate natural road resistance, even for descents. When calculating the brake resistance all physical formulas a cyclist encounters on the road are applied to reach a true situation. Air & rolling resistance, gradient percentage, weight, air pressure, wind speed, temperature, altitude, inertia & brake properties are all taken into account & calculated hundreds of times per second to achieve a realistic feel. Tacx trainers feature a dynamic control of the braking force. Other trainers use a flywheel to pass the dead centre, Tacx trainers constantly adjust the resistance to simulate the most natural handling. Thanks to the dynamic braking system virtual climbs become real challenges. The Genius Smart even has a downhill drive. The wheel keeps turning, just like in real life you do not have to pedal. This Tacx trainer best approaches reality. What is Zwift?