Tire pressure nonsense

wolftimj · Nov 13, 2024

I just switched out the 255-70-18 KO2s that I got with my rig for 285/75-17 HD-Terrains on AO XT rims. Got rubber at Costco and had them swap the original TPMS into the new tires in same position. Worked well. The nonsense part, maybe; they said since they are E load range while originals were D so I needed to run higher pressures. I cannot find anything online to confirm this, everything I find says to run at the same 36psi I had before. Anyone think Costco is right?

trobex · Nov 13, 2024

wolftimj said:
I just switched out the 255-70-18 KO2s that I got with my rig for 285/75-17 HD-Terrains on AO XT rims. Got rubber at Costco and had them swap the original TPMS into the new tires in same position. Worked well. The nonsense part, maybe; they said since they are E load range while originals were D so I needed to run higher pressures. I cannot find anything online to confirm this, everything I find says to run at the same 36psi I had before. Anyone think Costco is right?

... no Cost Co. Run at 36/38psi at ambient or whatever road comfort you desire (below 34psi on asphalt will lead to eventual uneven wear on these larger format rubbers). I have discussed this one before with the guys at Bob Janes. This is general advice only.

Dokatd · Nov 13, 2024

Costco is definitely wrong, unless you are looking for max load.

For daily driving on my 315/60R17 Goodyear Territory MT’s I run about 30psi. Chalked the tires to set optimum pressures.

MurphyMurph · Nov 13, 2024

E-rated tires have a stiffer sidewall and are designed to run at higher pressure than D-rated tires. This also means that running at lower pressure won’t cause as much deformation because the sidewall is helping hold the weight of the vehicle instead of air pressure. Running at lower pressure will make it ride smoother, but will increase wear on the shoulder blocks and decrease handling and likely stopping performance.

I change my pressure all the time just to see how it rides. I’m currently at 40psi front and 42psi rear on stock KO2s. I was running 36 psi all around for a while but wanted to help out with fuel economy now that our gas has switched to the higher ethanol content “winter blend”.

Hope that helps!

MurphyMurph · Nov 13, 2024

wolftimj said:
I just switched out the 255-70-18 KO2s that I got with my rig for 285/75-17 HD-Terrains on AO XT rims.

Pics of the new wheel/tire combo?

wolftimj · Nov 14, 2024

Zimm · Nov 14, 2024

Seems like odd advise. E has a stiffer sidewall and is less likely to deform. although results may vary brand to brand so a direct comparison is really stupid. I'd error on not pissing off the Gren TPMS gods and keep it the same.

Winterhawk · Nov 15, 2024

Tire pressure is never nonsense. Too many people have no clue what they should be running. FYI, did you know the lowest pressure you should run for E rated tires is 35psi (road pressure, not off road)? There are pressure charts you can use to determine the correct pressure for your tire/ vehicle combination, or you can use the link below to determine the correct pressure (when tires are cold) if you change the size/rating from stock. https://tiresize.com/pressure-calculator/

wolftimj · Nov 16, 2024

Winterhawk said:
Tire pressure is never nonsense. Too many people have no clue what they should be running. FYI, did you know the lowest pressure you should run for E rated tires is 35psi (road pressure, not off road)? There are pressure charts you can use to determine the correct pressure for your tire/ vehicle combination, or you can use the link below to determine the correct pressure (when tires are cold) if you change the size/rating from stock. https://tiresize.com/pressure-calculator/

That is one of the sites that confirmed what Costco had told me was nonsense.

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