Its been years since I've built anything, but I've got the itch. I first built an electric offroad go kart for my Son powered by a delco generator. It had 18-9.50-8 turfsaver back tires and was geared so low it would crawl over anything. It used field control for a throttle. Now I'm wanting to build something similar but 2 wheeled this time. I have a 12/24v 4.5 hp GE 2950 rpm series motor I plan to use. I need a rock climber with ample ground clearance and enough oomph to carry me up at least a 20 degree grade in some very rocky countryside, where I hunt. Top speed can be as low as 10mph. I just found your site. I can see I'll be busy perusing this good info I've seen already.