Toyo M/T Tire Size and Width
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They will work with your stock 20's but like Wandell said you will have some rubbing i personally put a 1inch bolt on spacer on the front to prevent rubbing on the A arm , You have to do alittle trimming on the back of the fender wall but other then that i have no rubbing with Toyo M/T 35's you just have to off set the front the back will be fine
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