Kinetic z rollers trainerkinetic z rollersare the perfect option for developingbetter balance and technique or for pre race warm up precision machined aluminium rollers and premium bearingsprovide a smooth quiet ride a lightweight aluminium framefolds down for easy transport and storage features adjustable to fit bikes with a wheelbase from 382 to 433 inches 97cm to 110cm lightweight aluminium frame folds down for easy transport and storagebuy kinetic training from chain reaction