The Tacx IRONMAN trainer is the ‘ Official Cycle-Mounting Trainer’ of IRONMAN to help you improve your Cycling performance for your next big race. The Tacx IRONMAN trainer is the ‘ Official Cycle-Mounting Trainer’ of IRONMAN. If you are a dedicated triathlete, this interactive trainer helps you to improve your performance. Just like the i-Genius Multiplayer, the Tacx IRONMAN trainer uses the most advanced resistance unit & software which analyses performance & simulates bike courses very accurately. The wireless motor brake converts the properties of the terrain into resistance on the bike, in a highly realistic manner, & speeds up in descents. The bike route is displayed on your computer screen. The Tacx IRONMAN trainer comes with the Skyliner front wheel support, the Kona water bottle & the Tacx film of the IRONMAN World Championship bike course in Hawaii (for TTS 4, Advanced). 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?