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I run my 255/45/17 Bridgestone RE71r around 34. I started at 38 and adjusted accordingly, finding the sweet spot between 32-34. Get a nice tire pressure gauge with release valve and check pressures after each run because they'll change.

Find someone running the same tires and pick their brains. Most people are super willing to help. Have fun!!

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@TecShdw what did you run the F1s at? Didn't you run them the first year you had your ST like all year?
 

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I did run them my first season in ‘13. I had to run the fronts around 42 lbs to keep them from rolling. Some of that may have been inexperience, other just the tires.
 
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