I have an Iseki with 8.3-22 Rice tires on the rear and 6-12 on the front. I'm finding out that it's tough and expensive to find turf tires this size. I've noticed that a common size seems to be a 24 inch rim on the rear and a 14 inch on the front. It looks lile I have a 6 lug design. Do the standard 24 inch rims have the same lug design and is it possible to switch? I know since I have 4 wheel assist I have to maintain a 0 to 5% overdrive to the front. Anyone have any thoughts on increasing the rim size? I have the fender clearance.