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GoJak Operates on the principle of an quick action bi-directional ratchet. Mechanical leverage applied to the foot pedal progressively “squeezesthe vihicle tire between two rollers until the tire lifts smoothly off the ground. The rollers touch only the tire – no contact with the vehicle’s frame or undercarriage is necessary. The low center of gravity after lifthing helps make GoJak safe and stable in use. It’s purely mechanical design eliminates the need for electrical power hydraulic elements or compressed air. The Model 4520 Was developed for the race car industry. You can effortlessly lift and move cars with tires as wide as 20 inches and up to 36 inches tall. The unit will handle wheel weights off 1125 lbs. up to 4500 lbs with four units. Twin rollers on each axle guide the tire smoothly up and over the axle support bar to lift wider tires. The unit uses a bi-directional linear ratchet for the jack portion and has a 5-degree offset pedal angle fo additional foot-to-tire claerance. The Model 4520 series is recommended for use on smooth surfaces. The axle supports present a lower profile by using four very heavy-duty double-ball 3-inch diameter caster. However smaller diameter wheels are less maneuverable on rough surfaces. Available in left and right hand units.