Train indoors all winter long! Hooks up to just about any bike--including road and mountain bikes with a 26 inch to 28 inch, or 700cc wheel!! Get off the couch and onto the state of the art RAD MAX Racer by RAD Cycle Products, specifically engineered for fitness and endurance indoor training. Out of all the trainers we tested, none of them compared to price and the quality of this trainer! Regardless of the weather outside you will be able to stay in shape. The RAD MAX Racer by RAD Cycle Products offers seven levels of of powerful magnetic resistance so simulate multiple road conditions.