First jeep tire pressure advice for new shoes!!

[emoneymose]

Hi all. Very happy to have gotten my 22 rubicon this week! Have had keeps but only grand cherokees previously. 3 days in and mods have started ?. Had teraflex spacer level put in up front and 35/12.5/20 tires and wheels slapped on. Set up came from custom offsets mounted and balanced and I think they’re overinflated??? Tpms shows 43 psi. Rides great but on some potholes I feel like a shimmy in suspension rather than a soft absorption. Should I deflate to about 35 to make it softer and less stiff? Tires are e rated radar renegade RT. They handle better than the stock cornering but the stiffness is apparent absorbing bumps. This is all new to me so please ignore my ignorance!!excited to get to know this truck and this community! Also any suggestions for a tool to use to deflate and inflate as needed. Will be daily driven mostly and beach a little since it’s end of summer almost.

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[kevman65]

Take them down to 32 psi and see how you like it.

When you have the time, Google "Tire Chalk Test" and then do it, that will tell you the optimum pressure for full tread contact on road.

 

[emoneymose]

Take them down to 32 psi and see how you like it.

When you have the time, Google "Tire Chalk Test" and then do it, that will tell you the optimum pressure for full tread contact on road.

Thanks for the tip. Take down and then do that test? Or test as it is now? I appreciate your help

 

[kevman65]

Watch the video first. I would start around 36 or 38 psi for the chalk test, then you just have to let air out as you go.

The 32 psi is when the tires are cold, they will climb to 36-38 psi when they warm up.

I run my 35's at 30 psi cold in the summer time, takes them to 34-36 psi when they heat up.
In the winter time I'll bump them to 34 psi with clean roads, 26-28 psi if we get decent amount of snow.

 

[Rusty PW]

I run 34 in the front and 32 in the rear. Do the chalk test. You will be within a few psi of what I got.

 

[jay21mojave]

The actual chalking is at 1:55 in the video.

 

[emoneymose]

Great info! Thanks all. Is there some sort of tool or pressure thing that will help me air down to different spots or is it a manual thing just letting air out and seeing where I am with an old school tire pressure gauge? Again, excuse my lack of knowledge and thank you.

 

[Rusty PW]

Get yourself a good dial tire pressure gauge. 0 to 60 psi.

 

[Lunentucker]

I run 32 on mine but they're on 17s.
I'd recommend 35 on yours with that setup.

 

[drewcnit]

Great info! Thanks all. Is there some sort of tool or pressure thing that will help me air down to different spots or is it a manual thing just letting air out and seeing where I am with an old school tire pressure gauge? Again, excuse my lack of knowledge and thank you.

I started with one of these - https://www.amazon.com/Alien-Deflator-Offroad-Pressure-0-75psi/dp/B07PQL3GVF

 

[emoneymose]

I started with one of these - https://www.amazon.com/Alien-Deflator-Offroad-Pressure-0-75psi/dp/B07PQL3GVF

Thank you! Order placed

 

[ShadowsPapa]

I contacted the consumer engineer for the company that made my tires. I told him the weight of my truck, the tire type and size I bought, he asked what it came with and the recommended pressure for those, and in a few seconds he told me what to run. He was spot-on.
In fact, oddly, when I had these tires transferred from my 2020 to the new 2022 by the dealer I bought the Jeeps from, they actually filled them to what that guy recommended and I was shocked as heck - normally dealers seem to have their gauges stuck at 40 or better.

I tried the "chalk test" on my tires and the results were exactly the same with pressures 5 psi apart.
I've got a few thousand on these tires now and they are wearing evenly across the face using their recommended pressure for my truck weight.

43 is crazy high - unless the air temp outside is 100 degrees and you've been driving a while.
Rule of thumb - the bigger the footprint of the tire, the less pressure you run.
Moving from tires that are the same, but 1" or so wider, the pressure would be lower on the wider tire because the pressure is working on more square inches to hold the truck up.

 

[emoneymose]

I contacted the consumer engineer for the company that made my tires. I told him the weight of my truck, the tire type and size I bought, he asked what it came with and the recommended pressure for those, and in a few seconds he told me what to run. He was spot-on.
In fact, oddly, when I had these tires transferred from my 2020 to the new 2022 by the dealer I bought the Jeeps from, they actually filled them to what that guy recommended and I was shocked as heck - normally dealers seem to have their gauges stuck at 40 or better.

I tried the "chalk test" on my tires and the results were exactly the same with pressures 5 psi apart.
I've got a few thousand on these tires now and they are wearing evenly across the face using their recommended pressure for my truck weight.

43 is crazy high - unless the air temp outside is 100 degrees and you've been driving a while.
Rule of thumb - the bigger the footprint of the tire, the less pressure you run.
Moving from tires that are the same, but 1" or so wider, the pressure would be lower on the wider tire because the pressure is working on more square inches to hold the truck up.

Makes sense when you explain that. Thank you!

 

[Rusty PW]

Tire pressure at 43 psi. will ride hard. When I picked my JT up. The dealer had 41 psi in the tires. On the way home. It felt like I was riding on basketballs. It drippled down the road. The only time I run that high of psi is when i have a load in the bed.

 

[ZoMojave]

33" KO2's on 17" wheels here. I run 35 PSI cold. They go as high as 38-39 PSI on a warm day though.

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