I welded another bicycle rim to one of the existing tire and wheels and with a v-belt in the rim and small pulley on the electric 900 watt 36 volt motor,I found that my speed was 7 mph @ 12 volt:14 @24 and at 36 volt I shut it down when the trike was approaching 25 mph.The tires ,brakes and chassis weren't good enough for" high speed."