Cycleops aluminum roller with resistance unitsee your fitness and your bike handling skills improve when you add cycleops rollers to your training program youll 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 whether you choose to go at an easy spin or a more intense pace after a winter on rollers youl