Kinetic Z•Rollers are the perfect option for developing better balance and technique, or for pre race warm-up. Precision machined aluminum rollers and premium bearings provide a smooth, quiet ride. A lightweight aluminum frame folds down for easy transport and storage. Z•Rollers are adjustable to fit bikes with a wheelbase from 38.2 to 43.3 inches (97cm to 110cm). Kinetic backs it up with our Unconditional Lifetime Warranty. Click on the video link to the left to see the Kinetic Z•Rollers in action.