I have just found that 3.5 X 19 Avon Triple Duty Mk2 Side Car tires are available locally here in NZ. Cycletreads Chch found me a set at $180 each, which I was pretty happy with. Just put the first one on today, will let you know how they go.
Check Trade Me motorcycle tyres. They are dual purpose Pirelli and would be very suitable for a CJ750 rig. Not a flat tread but for the price of $25 or so who would complain and can you get flat treads anyway?
