Put your wheels on CycleOps' Aluminum Rollers with Resistance and feel the smoothness of the precision rollers. It’s like riding outdoors! And, with 5 levels of resistance, you’ll stay in shape all winter and blow away the competition come spring. CycleOps' unique resistance design uses no moving parts. The rollers are mounted on a steel frame with a bi-fold design for convenient storage and transport. The rollers feature an adjustable belt for right and left dismounting, an easily-adjusted wheelbase and a limited lifetime warranty.