An extended rear axle carried cultivator wheels designed to handle rough terrain. Two driving wheels in the rear worked well. Cultivator tires didn't. The biggest challenge would be finding a tire capable of getting a grip on soft, changeable terrain such as snow, sand and mud. Two wheels, three wheels, four wheels or more?Motorcycle tires weren't an option. The design process quickened when American Honda sent Takeuchi an American invention called the Amphi Catand that rolled on six 20 inch low pressure, high flotation balloon tires. The light bulb went on. Revamping his ST70 based prototype to accept the new low pressure rolling stock, he went to work on his own tire design, ending up with a 22 inch tire inflated to 2. 2 psi. With the tire dilemma solved, the 70cc engine lacked the muscle necessary to push a full sized rider through snow or mud. A 90cc engine running through a special dual range four speed gearbox added the requisite flexibility over varied terrain.

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