not sure of the offset, but I was running steel 8-spoke 13" wheels, with 185/60 Mud+Snow tyres on (all originally KINGPIN make, now just fronts are KINGPIN Mud+Snow, -rears wore out, fronts getting low). Am changing to 205/60/13 road treaded tyres, on same wheels, as they were so, so cheap, (£156, for all 4, fitted and balanced!). I have some Hillman Imp steels, 12", which I'm gonna get widened, and fitted with 12" quad bike -type road legal, (if possible), mud tyres, if not, just dumper type ones. This way I can enjoy best of both worlds, - the 205's for road use and light green-laning, and the 12" dumper/quad ones for more serious off-road use, except trials, as I understand they have to be road-type tread. Also at the moment, I'm using 5mm spacers. Pictures will follow soon...