A 215/75 series Goodyear Marathon is 8 1/2 inches wide at the sidewall. A 225/70 Firestone Indy 500 is 9 inches at the sidewall. A 75 series tire would give you a little more clearance. Without extending the axles, another option would be changing to rims with a greater offset to bring the tires out. However, the cost of new rims($500-$600) or modifying the axles ($100) is to be considered. I also looked at installing wheel spacers, but gaining only 7/16 to 1/2″ and also having to replace all the lug bolts, it still wasnt enough clearance for peace of mind. Im looking at gaining 1 1/4″ on each side by changing the axle length. More than enough clearance even with 225/70 tires. Besides, it gives it a wider, meaner stance.