For riders looking for the classic feel of precision rollers, the Zero-Drive Rollers offer an adjustable wheelbase dimension and a stable platform for intense efforts. With 5? wide, 3.25? machined aluminum drums your workouts are as smooth as silk and quiet as a mouse. The powder-coated steel frame and zinc-plated hardware resists corrosion and folds in half for travel. Add a Floor Mat for the ideal indoor cycling workout setup.