Hello , im building frame similar to super73, i use 24 wheel and 3inch thick tire, bike will be mostly used on beach, sometimes i want to drive with passenger so two people on one bike, what engine should i buy? geared or direct drive? how much power? i wast thinking about dd somethink like 7x9 or 10x6, but maybe geared version will be better? i dont need much speed, about 30-36km/h more i need torque to drive in sand or with passenger.