Based on your experience, what is the best tire pressure to run 35" BFG KM2s at for daily driving. Aiming for longevity and even wear above ride comfort.
Chalk test it to see what pressure will give you the best wear, from what I've read most people run about 30 on 35s with 17" wheels which is what I'm at but the best bet is to chalk test and as you probably already know re-chalk test in the summer and winter as the warmer/colder temps change your tire pressure.
And if you don't know what the chalk test is which you probably do so ignore the rest of this post but, you get a piece of chalk and cover a part of you tire with the chalk make sure u get the full width of tread and then drive forward just a couple feet enough for you tires to rotate once or twice and look where the chalk wore off. If it wears off in the middle more that the edges you need to deflate the tires a little bit if it wears more on the edges then you need it inflate them a little more. This will give you the most even wear and longevity.
When i first had my 35s on I ran them way too high and the middle wore out more, now I've dropped them down to wear correctly and my ride is a lot better too.
I run my tires a little higher when im in the city. I like to run 35 or so cold. Usually that's just for the MPGs. Gives you a harder ride overall but does help save some gas with those mud terrains.
I emailed bf Goodrich to get the appropriate PSI for my KOs. I gave them all the info on my vehicle and they told me the best pressure. You can confirm with them. They get back pretty quickly.
I have a 2dr jkhr with 35x17 KM2's. When I called Goodrich they told me 28 lbs. would be what they would suggest to be at the correct weight carrying for those tires. But I generally run at 30 on the street.
Been running 30 psi and no issues. Even wear, and the ride is good. Air up to 32 - 35 for longer trips, but its a little harder ride. Chalk test works best.
You have been given bad info, period. Everyone else, including BF Goodrich, runs closer to 30 psi on a 34-35" tire on their jeep. 40 psi, as you're running, will ride rough, be less safe due to a decreased contact patch with the road, wear out the center of the tire sooner, etc. 40 PSI is higher than a stock Jeep, with much smaller stock tires is recomended to run. The larger, wider the tire, the lower the pressure that's required to support the weight of the vehicle because it's being distributed over a larger surface area. Not much more to say.
I remember back in January I didn't have time to change my oil in my jeep so I went in to get my oil changed before I had to head out to Richmond VA from NC. They got done I jumped in my jeep and immediately I thought, damn my shocks are messed. I thought for sure my shocks were going bad on my jeep. I got home jumped out checked them out, they looked fine. I then thought about it and checked the tire pressure, they had put 39lbs in every tire. I aired them back down to 32, since I was about to head 6 hours up the road, back to the way it was. To much air will impact your ride for sure.
AEV and BFG both say 28PSI cold, I run slightly higher pressures to even out wear and compensate for offroading.
I ran them at 40 for two days to see the fuel savings but the ride was attrocious, so I do not go above 33. If you do not do your own oil changes you probably always drove at around 40PSI as jamiejku mentions as well. Always air down after oil changes as the teenager who changed the oil will go by what he was told by anyone other than you....
I've been running 35 psi in my 35" BFG KM2s but today dropped them down to 32 psi. It felt smoother on the ride, I'll experiment more based on the info shared here.
I would think pressures would be different with different size wheels. I have 35x12.50x15 Dick Cepek Extreme Country's. And I have them mounted on 15x8" wheels. I run mine at 25psi for street use, and 15psi for trail, I've had to drive a short ways on the street to get where I could air up after riding trails and the 15psi didn't feel "too low". But just for better mpg's, I keep them at 25psi, with the chalk test results about a 1/2" of the shoulder tread block doesn't touch the pavement
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