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They are intended for heavier loads and higher pressure, which is why most folks run them around 105 to110 psi. I run mine at 107 and keep them there. They have a very heavy side wall and a low pressure (80 psi) causes more side wall flex which causes more heat. Also more stress and flex on sidewall when turning, especially in tight turns. If you run them at a higher pressure they will stay cooler, roll easier, should give you better mileage, and less wear on edges. Unless you put lots of miles on them, they will age out before they wear out.
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