Actually, 235/80/16 is an ST trailer tire and without going into my reasons I chose to go with an LT tire. I am still debating on 235/85/16's but the math put them at just about 1.25" gap between tires and others have said that was ok for them I'm not sure. The other size I'm debating between is 245/75/16, they are close to the height of the 235/80/16, but a bit wider. I was quoted the similar price between the 2 sizes and both are special order for my Costco, btw that's for Bridgestone Duravis R250 rib style commercial light truck tire.
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