robcarync
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- Raleigh, NC
I am curious to learn from others that are running 33 x 12.50 on stock 15x7 rims: what street tire pressure are you running to get your contact patch flat for even tread wear? I know it depends on which tire, weight of vehicle, but I am curious to see what everyone else is running.
I recently installed General Grabber ATX tires, load range C2, max PSI of 35 and load index 108.
Per load index chart at Discount Tire Direct: My tire carries 2205 pounds @ 35 PSI. Multiply by 4 tires = 8,820 total vehicle weight if inflated to 35 PSI.
https://www.discounttire.com/learn/load-range-load-index
Curb weight of 2004 Nissan Xterra is 4,075 pounds. Gross weight (maximum loaded weight per owners manual) is 5,200 pounds. I have steel rock sliders (~100 lbs), front bumper (~100 lbs) + winch (~80 bs), and rear bumper and tire carrier+high lift jack (~200 lbs). Add a couple of passengers and I am pretty close to the 5200 pound spec.
This means my ~5200 pound Xterra is only using (5200 / 8820) 58% of the load capacity of the tire.
Multiply 35 max PSI by the 58% load ratio, and that equals ~21 PSI, which seems crazy low.
I am currently running at 30 PSI, but I am not making full contact on the outer edges of the tread blocks. Are these large volume tires designed to be run lower than that? I see a lot of jeep guys on forums running in the 26-28 range.
I recently installed General Grabber ATX tires, load range C2, max PSI of 35 and load index 108.
Per load index chart at Discount Tire Direct: My tire carries 2205 pounds @ 35 PSI. Multiply by 4 tires = 8,820 total vehicle weight if inflated to 35 PSI.
https://www.discounttire.com/learn/load-range-load-index
Curb weight of 2004 Nissan Xterra is 4,075 pounds. Gross weight (maximum loaded weight per owners manual) is 5,200 pounds. I have steel rock sliders (~100 lbs), front bumper (~100 lbs) + winch (~80 bs), and rear bumper and tire carrier+high lift jack (~200 lbs). Add a couple of passengers and I am pretty close to the 5200 pound spec.
This means my ~5200 pound Xterra is only using (5200 / 8820) 58% of the load capacity of the tire.
Multiply 35 max PSI by the 58% load ratio, and that equals ~21 PSI, which seems crazy low.
I am currently running at 30 PSI, but I am not making full contact on the outer edges of the tread blocks. Are these large volume tires designed to be run lower than that? I see a lot of jeep guys on forums running in the 26-28 range.