it really depends on how much power you are planning to throw at the tires. with a mild combo like litle g has you can run 235/60-15 drag radials with great success. with a proper suspension set up you would eb good on the 235's anywhere below 300hp prolly.
i have seen plenty of people put 275 section drag radials onto stock 7inch wide wheels.
if you want to go bias ply you can get hoosier 26x9.5's to fit easily.
later
tim
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