My last k-10 had 4" and 35x12.5 They might have rubbed a little in normal street driving but would rub bad when flexing ('73). My '79 now has 6" all spring and I have not flexed it well enough to see if these 35x12.5 will rub not that it matters since when i find axles or gears it will grow up more. If you grease your shackles and such you get more flex but with the 6" in street driving there is no way they will rub. although these dunlops seem to be smaller than the chapperal ap on the last truck.