The Steering System has two different modes, CRAB and STEER. In crab mode, all wheels turn together in a 1 to 1 ratio with the Steering Post. When the Steering Post turns 45 degrees, all the wheels turn 45 degrees, when it turns 90 degrees, all the wheels turn 90 degrees. They can be infinitely rotated, but must be in the straight position or 180 degree position to shift to the steer mode. The front wheels must be straight in order to steer properly.

In steer mode, the front wheels are locked in a straight position, and the rear wheels turn at unequal rates in order to 'track' properly for sharp turns. This is accomplished by moving the Upper Sprocket Assembly(2) while turning the Steering Post. The Steering Post will only turn 90 degrees to the left and 90 degrees to the right. It must be brought back to the straight position to shift into crab mode.


For proper steering and noise reduction, the upper and lower chains must be kept at the proper tension. The chains should be firm, with no slack, but not stiff.


The upper chain has a Tension Spring(10) to allow for minor variations in length when the Upper Sprocket Assembly(2) moves in the steer mode. To adjust the tension, make sure the Steering Post is in the straight position, or crab mode, and turn the Tension Nut(11) for the proper tension. Do not compress the Tension Spring more than 50%.

Figure S1

1 Steering Post Lock Nut
2 Upper Sprocket Assembly
3 Upper Steering Chain
4 Lower Tension Port (2)
5 Lower Steering Chain
6 Front Wheel Sprocket (2)
7 Tension Block Screw (2)
8 Upper Tension Bracket
9 Rear Wheel Sprocket (2)

Figure S2

10 Tension Spring
11 Upper Tension Nut

Figure S1

Figure S2


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