The Kurt Kinetic Z-Rollers are the perfect option if you are a developing rider that wants to improve their balance and technique or for a pre-race warm up. Precision machined aluminium rollers and premium bearings provide a smooth, quiet ride. A lightweight aluminium frame folds down for easy transport and storage. ZRollers 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 ZRollers in action. Rollers are not for everyone, only for riders who already posses a substantial measure of skill. You are already good, these will make you better. Coming completely assembled, all you have to do is un fold the frame, adjust the drums to your bikes wheelbase and off you go.