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. The next phase of development was optimizing the chassis to match the new engine and tires.
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Production of threewheelers ceased in 1987 due to safety concerns: three wheelers were more unstable than four wheelers although accidents are equally severe in both classes. The duration of the voluntary cease of production manufacturers were not required to halt production but agreed to it lasted 10 years and thus since 1997, manufacturers were free to once again manufacture and market three wheelers. A ban on sales of new or used three wheelers and a recall of all remaining three wheelers has been proposed by the American Academy of Pediatrics. However, it was determined in a CPSC study that three wheelers are no more dangerous than other ATV's. The ban lead to widespread thought that the machines are unregistrable, uninsurable, dangerous, and even illegal, but is false. These safety issues with three wheel ATVs caused all ATV manufacturers to upgrade to four wheel models in the late 1980s, and three wheel models ended production in 1988, due to consent decrees between the major manufacturers and the Consumer Product Safety Commission—the result of legal battles over safety issues among consumer groups, the manufacturers and CPSC. The lighter weight of the three wheel models made them popular with expert riders. Cornering is more challenging than with a four wheeled machine because leaning into the turn is even more important, to counterbalance the weight and keep the machine stable. Operators may roll over if caution isn't used at high speeds. The front end of three wheelers obviously has a single wheel, making it lighter, and flipping backwards is a potential hazard, especially when climbing hills. Rollovers may also occur when traveling down a very steep incline.
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