The Hand Magnum draws on over twenty years of development at Greenspeed, plus has a host of new features over previous Greenspeed Hand Cycles. Right from the start we realized that unlike most bike riders, hand cycles riders were not normally able to get off their machines and push if the hills were too steep, so we added extra gearing systems which enables riders to climb mountains when they felt they needed the challenge. The Hand Magnum continues this theme by using three gearing systems. A nine speed derailleur system, a three speed rear hub, and two speed crank system. This gives a gear range of 946% or from 12 inches to 110 inches, plus the hub gears and the crank gears can be changed both while in motion and when stationary.