See your fitness-and your bike handling skills-improve when you add CycleOps rollers to your training program. You"ll increase your balance, control and ability to ride a straight line, all of which translate to more efficiency, power and technique on the road. And because you have to pedal 100% of the time to balance your bike, you get an amazing workout. After a winter on rollers you"ll be poised to lead the pack in the spring. Not only do rollers provide the most awesome stationary workout with incredible real-world ride feel, but they"re also simple to set-up, store and transport. For warming up before a race or watching the time fly by during an indoor ride, rollers offer the ultimate in versatility and simplicity. CycleOps Aluminum rollers are a great starter set for indoor and outdoor use because they won"t distort in heat or sunlight. This magnetic bar that works within the magnetic field of the rolling aluminum rear drum, allows you to increase the difficulty of your workout without any extra noise. CycleOps rollers can be conveniently folded for grab-and-go transport and out of the way storage, so training areas stay clutter-free. CycleOps Aluminum rollers are built to last and carry a lifetime warranty. Constructed from bi-fold tubular steel they can stand up to all sorts of abuse-like being tossed into the car, set up in parking lots at races, getting stepped on and the general rigors of daily use. We also guarantee that if anything ever breaks on it, we"ll fix it or replace it. The 3.25-3.5" precision lathed drum diameters offer an optimal range of resistance with a super smooth ride and the adjustable wheel base fits just about any size bike. Rubber foot pads ensure that the only thing moving on the rollers are the drums so you get a secure, sturdy ride. Because mastering the rollers can take a few tries, the 16" wide base gives you room to move around until you"re holding a straight line like never before.