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Some people say that you can get away with 285's but i cant see that happening without rolling the fenders, or drag bags.
 

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First off those aren't radials. Those 26 11.5 17s are bias plies. Bias ply tires are usually used only for the track and paired with bias ply front tires or you can get weird lane walk. The size M/T bias used are 26 10.5 17 and that should be on 9"-10" wide wheels.

Even with radial ply tires to get a bigger tire in back correctly you need the 9-10" wide wheel and a healthy offset. Rolling or cutting the outer lip is often needed for 275-295 tires.
 
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