If you are wanting it for use in a two wheeler environment and want it as quiet as possible, the only practical option really is a SurRon. They have been around longer than most wannabe electric dirt bikes and cover the range well: A light bee is a beefed up MTB, an Ultra bee is the best option (85kg,140km on flat tar seal range, 240mm suspension), and their Storm bee is the uprated give-a 450-MX-dirt-bike a run for its money. The SurRon will handle water far far better than the Ubco. Ubco have tiny wheels, the insignificant suspension travel means the two wheel drive can't really do its job properly, and those tiny wheels kill it in lumpy terrain. Water up to the axle, and its good night nurse for the elece motors
Otherwise just go a reliable quad.
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