As the world's first magnetic trainer with progressive resistance, the Magneto increases resistance as you increase pedal speed, so your effort and speed follow each other on a natural curve. There are no manual adjustments needed, simply shift gears as you would when riding outside.With a quick load cam lever, you simply adjust the resistance unit once and then lock it into place each time you put your bike on the trainer. This way there are no guessing games in setting resistance from ride to ride. Combine this with a smooth, quiet ride, locking bolt ring and heavy duty steel construction, and you're ready to sprint, spin and climb with confidence. No wobbles. No hassles. No reason not to ride.When riding outside isn't an option, the Magneto trainer is. Instead of succumbing to the elements, simply bring your bike inside for a worry free ride and spend your time training, not cleaning road grime off your frame. Build your workouts around your goalsnot the weatherand see major results when the sun shines again.