REV-1 wheels are geared to provide users with a mechanical advantage that translates into a 25% less effort/pulling forces when compared to standard wheelsets. This makes the REV-1 much easier to use compared to a traditional wheelchair, helping you stay mobile longer. REV-1 wheelsets use Rowheels’ patented technology. Unique pull to move forward design is proven to eliminate the forces that lead to injury and pain in the shoulders, elbows and wrists. Pulling on the handrims uses more capable muscles in your upper back and shoulders resulting in more stable and healthier shoulder joints.