Tacx Magnetic Bicycle Rear Wheel Trainers
About Tacx - "Tacx shares the passion for the sport of cycling with you. Work on your fitness, improve your personal bests, reach the summit of your capabilities: you can count on Tacx. You just take care of training and discipline, we will provide the means and possibilities. Ambitious athletes are our inspiration. Champions like Fabian Cancellara and Alberto Contador do not settle for anything but the best, they always use the Tacx trainer to warm up for big races and time-trials."
Trainer resistance is available in fluid, wind, magnetic and electronic. Magnetic trainers are most common and have fixed levels of resistance. Fluid trainers have progressive levels of resistance; the harder you pedal, the more resistance they provide. Wind trainers tend to be very noisy, as they generate their resistance from a fan. Electronic trainers require a power source and can often provide the most powerful and precise levels of resistance. They sometimes can include virtual reality interfaces for a more interactive experience.