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yes, those tire sizes make a difference. 245/35/20(26.8") is 1" greater diameter(=0.5" sidewall larger) than 245/30/20(25.8"). the tire shoulders are 0.5" closer to the spring perch and at full lock, the fenderwell liners.
on the rear 275/30/20 is just 0.2" diameter smaller(=0.1" smaller sidewall) and 10mm less width so the 275 tire shoulder is tucked 5mm further in than a 285.
the small differences are the difference between rubbing and not
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