The factory tires are suppose to be 225/55-16 but you can put 245/50-16 tires without a problem on all four wheels and your speedo will still be correct yeah the factory wheels are 7.5" wide found out when I had a set put on factory wheels a couple years ago lol
I pondered this same question almost a year ago and decided to just wait for bigger rims instead of getting bigger tires on the crappy factory wheels, worked out great with looks and traction
BV heads, P&P lower, windstar upper, comp 218/226, 4.2 bottom end, 3k stall, flow 40's, O/R x-pipe, Pacesetter lt's, Xcal2, 65mm tb, CAI, 8.8 w/ 3.73's, MM LCA's
coming soon: blower cam and intercooled M112
dealer for Ortiz Performance; tunes, cams, etc. PM me!