Kurt Kinetic's Road Machine Trainer features an automatic resistance unit that adjusts as you change speeds so you get a true outdoor simulation. With a 6.25 lb. flywheel and a sealed fluid chamber pushing back, you get a natural resistance feel and a lower operating temperature for consistency. When it's time to store or transport the unit, simply fold up the legs and tuck it away. And, thanks to the 2 1/8-inch roller, tire wear is reduced significantly.