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At 18 mph and a vehicle weight under 50 kg with 4 wheels you can likely use industrial plastic wheels and tubeless mountain bike tires. The issue with the CVT is in belt slippage. With a centrifugal clutch system the engine will reach a specific rpm before the wheels engage. Depending on the engine cam and timing, operating rpm would be 3000 to 4000 rpm. Compare engine torque at that speed to the rating of the internal gear hubs for bikes. A 50cc all terrain vehicle might be a source of parts also.
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