Back in the mid 70s had a 68 Bonanza BC1200, 12 tooth clutch direct to 60 tooth sprocket 4.10-3.50 X 6 tires, ungoverned 5HP briggs flat head, my stepdad clocked me with the car at 35mph or so, built a replica recently and it feels the same, like stepping into the wayback machine!!...................Tom.