Your question was what size can you get on the wheel, not what size is the max that will fit properly. Yes, you can squeeze a big tire on a small rim. What happens is the sidewalls are pinched in. This causes the center of the tread to bulge outward resulting in your wearing your tires out in the center. There are many websites that have min and max rim widths for tire sizes. Do a bit of research and then make your own decision.
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CW
Craigfield, Tennessee Member Music City Mustang Club '93 LX Mustang '56 Ford Thunderbird convert '06 Harley Street Glide '01 Harley Softail Custom
I did not think it was possible to get 275-50 on a stock rim. It took two of use the get 245 onto my ponys. But equipment isnt the greatest anymore.
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Probe Racing forged and balanced 347 stroker, AFR 185's, Comp XFI stroker cam .579 lift, Parker funnel web intake, MSD Pro-billet mech adv distributor, Scorpion 1.6RR's, bbk full length headers, Canton 7 Qt pan, Flow 40's, Holley 725 Double pumper carb jetted, 125 HP nitrous shot, Full QA1 front suspenion kit, BBk subframe ties, 3.73 rear gears, Barry Grant fuel cell, and no money for a transmission... or paint..
I'm replacing BFG Comp TA 245-50-15 rears and 225-50-15 fronts. They performed great. I remember watching them put the 245s on the turbines, it took a couple of tries. I wouldn't think that you could go bigger. I didn't think that they made anything similar anymore so I'm looking for new wheels.
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'88 Mustang GT-GT40 Iron Head Engine + all the bolt-ons, Kenne Bell SC/FMU, AOD, etc.
the biggest tires on turbines? 
