Im building a Utility bike from scratch using a 5hp honda gc160 and torque converter. The tubing is all 1.25" mostly from a couple pressure washer frames. The frame will be rather intresting. The giant swingarm will hold the engine and everything and there will be a tray above the back wheel to haul stuff with. The front half will pivot at the heels and thats what will give it suspension. its geared nice and low at about 14.5 :1 with a 21" tire. I have the same setup on a gokart so I know itll work well for this bike.