00PathfinderSE Posted August 10, 2014 Share Posted August 10, 2014 So just got some new General Grabber A/t2s 255/70/R16 and was wondering what air pressure I should fill them to? I had been filling my old Michelins (255/65/R16) to 26psi as per the placard inside the Pathfinder. They seemed to wear pretty evenly at that pressure. What do you guys run yours at? They are slightly larger tire, would that affect the recommended air pressure? Link to comment Share on other sites More sharing options...
lerch641 Posted August 10, 2014 Share Posted August 10, 2014 I've got Duratracs that I've been running at 40 psi (max is 50 psi). Doesn't it say the max pressure on your sidewalls? Link to comment Share on other sites More sharing options...
Karmann Posted August 10, 2014 Share Posted August 10, 2014 I would say 34 psi is my happy medium. Better mpg than stock but still a smooth ride. I'm not one to fill to the max level anyway. Link to comment Share on other sites More sharing options...
00PathfinderSE Posted August 10, 2014 Author Share Posted August 10, 2014 Don't care about ride or economy, just want even wear. Link to comment Share on other sites More sharing options...
5523Pathfinder Posted August 10, 2014 Share Posted August 10, 2014 Go with what is on the sticker, on the door jamb. Just because you increased the tires size, does not mean you changed the weight of the vehicle. I will also assume you did not change the Load rating(C,D,E) for your new tires, so again, any deviation from factory pressure is not needed. Overpressurizing your tires will just wear the center of the tread sooner and reduce the amount of tread patch contacting the road in corners. The pressure on the side of the tire is the max pressure for the tire. That should only be used when fully loaded or towing. Link to comment Share on other sites More sharing options...
01Pathmaker Posted August 10, 2014 Share Posted August 10, 2014 I'm running the same exact tires (size too) on my '01, don't remember off the top of my head, but will check and get back to you. I too am all about even wear so have adjusted accordingly. You could also do the chalk test, make thick lines across each tire then drive straight on a flat paved surface for a short distance, increase/decrease pressure until the lines wear off evenly. Link to comment Share on other sites More sharing options...
00PathfinderSE Posted August 11, 2014 Author Share Posted August 11, 2014 Tried the chalk test, still seems like 26 psi cold is the way to go for the summer anyway. Will probably bump it up to 28 psi in the winter. Link to comment Share on other sites More sharing options...
GePa Posted August 11, 2014 Share Posted August 11, 2014 Go with what is on the sticker, on the door jamb. Just because you increased the tires size, does not mean you changed the weight of the vehicle. I will also assume you did not change the Load rating(C,D,E) for your new tires, so again, any deviation from factory pressure is not needed. Overpressurizing your tires will just wear the center of the tread sooner and reduce the amount of tread patch contacting the road in corners. The pressure on the side of the tire is the max pressure for the tire. That should only be used when fully loaded or towing. How so? for example i went from the Stock to 265/70 r15 to 31x10,5 r15. Are you saying that i should the same PSI? Even if one is 30" and the other is 31"? Link to comment Share on other sites More sharing options...
5523Pathfinder Posted August 12, 2014 Share Posted August 12, 2014 How so what? Yes, i doubt a increase in pressure for a tire size that only increased 1 inch will make much of a difference, being pressure inside a tire increases and decreases with temperature. A pound or two is no big deal, but increasing the pressure to the max on the sidewall will create issues. Link to comment Share on other sites More sharing options...
MY1PATH Posted August 12, 2014 Share Posted August 12, 2014 Rub the tread with chalk and drive straight for 100ftCenter of chalk missing = PSI too highOutside of chalk missing = PSI too lowChalk evenly worn = Drive farther and or repeat to confirm...Still evenly worn? = PSI Just right. You can add 3-5 PSI from this point to ensure proper load handling(extra passengers, daily items etc) and MPG without any added wear to the tires. For my wifes AT tires this was ~35 psi and for my soft mud tires this was ~45 PSI both the same size but ply construction and stiffness varies greatly between the two. Link to comment Share on other sites More sharing options...
kdj Posted August 12, 2014 Share Posted August 12, 2014 I have 35 PSI in the new truck (245/70 16) and 40 in the old one (31x10.5x15). Link to comment Share on other sites More sharing options...
Leo98 Posted August 12, 2014 Share Posted August 12, 2014 For my wifes AT tires this was ~35 psi and for my soft mud tires this was ~45 PSI both the same size but ply construction and stiffness varies greatly between the two. What AT's are they? I have B/F Goodrich's A/T 30/9.5 R15 and the guy at Costco installed them and put 26 psi. going off what the door jamb and glove box stickers said. They feel like they are dragging when i drive and maybe hurting gas milage. I've never ran any tire that low, must be a mfg. reason for it. Link to comment Share on other sites More sharing options...
MY1PATH Posted August 12, 2014 Share Posted August 12, 2014 (edited) 26 psi was probably for a 235/75R15 tire? The sticker in the door is stupid, it gives a PSI rating for the tire the car was originally configured with. Unless you get the same tire the number will not be the same and even then it can change ex... Early 90's Uniroyal Laredo used to be a 6 ply tread with steel belted sidewall and would not look flat with 14 psi in it (I ran 32 psi in that tire). Todays Uniroyal Laredo is a 4 Ply and a lot more flexy. I don't think any passenger tire has a steel belted sidewall anymore? My wife has 31x10.5R15 Toyo Open Country.I'm running 31x10.5R15 Nokian Vatiiva MT Edited August 12, 2014 by MY1PATH 1 Link to comment Share on other sites More sharing options...
01Pathmaker Posted August 16, 2014 Share Posted August 16, 2014 What AT's are they? I have B/F Goodrich's A/T 30/9.5 R15 and the guy at Costco installed them and put 26 psi. going off what the door jamb and glove box stickers said. They feel like they are dragging when i drive and maybe hurting gas milage. I've never ran any tire that low, must be a mfg. reason for it. The reason the mfg says 26 (or any # for that matter, prior to the mid-2000's) was the same reason they would come with tires with a 180 treadwear rating (original tires on my '01 lasted a whopping 13k miles!) is for a more comfortable and quiet ride. Now, Ive noticed the recommended psi seems to be more, I can only assume that this is due to the increased push for better mpg ratings. As ever tire and vehicle vary, I've always found the "sweetspot" for the tires I'm currently running. Link to comment Share on other sites More sharing options...
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