I know this: my new tires are Forceum 08 Plus M/T tires LT 235 75 15 C load range 6 ply Q speed rating 99 mph max. Dad had a pair of 30 x 10 i think on his yota and boy did they scream. I think it woke up anyone we drove by at night, we had to turn the radio to max to hear it at all. Idk why but i find tire droning to be a thing of the south : a status symbol for real american trucks