Best thing I did was play with PSI

[CookieSoup]

I'm not a rocket surgeon so do what you want

So this all started as all great ideas and plans with beers around a camp fire i was complaining how soft i though my jeeps OEM spring rate was. then we got to talked about how squaty my good year duratreks are. 3 of the 4 other people with me were on duratreks as well so we had some others to glance at. granted they are all 1/2 tons but they were running between 55-65 have have for years with good tire wear.

i was running 32 ...... WHY 32? cause my dumb ass never thought to check the tire pressure after i took them off my JK when i traded it in on the JT and door says 40 and i never thought to check

SO i aired up to 40 on my way off from camping VAST improvement!!! and i think im up 1 MPG

So the now im playing more i have 40k ish on the tires and they still have good tread but if i kill them from tire wear i guess i go 35's

Trying 50 for the next couple months (i only drive it 1-2 days a week) i think it might be a hair high so i'll probably try 45 soon

THE POINT BEING if you have an air compressor play around a bit its free. if you have Duratreks try airing them up a bit i think the sidewalls might be a little soft


I have Expedition one front and rear bumpers with duel swing outs and a GoFast camper FYI for people thinking about curb weights

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[dcmdon]

Its funny. Most of the tire pressure threads here center around lowering the pressure.

My truck came with the Falken Wildpeaks set at 40 and the ride was choppy. I lowered them to 36 and it got better. I lowered them to 30 and it was too soft. I ended at 33 psi cold.

Do what works for you.

 

[Jeepasaurus_Rex]

I usually just do whatever gives me the best pattern on the ground, overall. Lol. For my 40's it's about 26psi cold.

 

[Discount Tire]

It's good to see you are checking pressures. This time of year when it's getting cooler the pressures will go down.

 

[ShadowsPapa]

It's good to see you are checking pressures. This time of year when it's getting cooler the pressures will go down.

By a lot!
My wife's Jeep told her they were 29 this AM - normally they are about 36.

Mine dropped at least 4 psi.

Trying 50 for the next couple months (i only drive it 1-2 days a week) i think it might be a hair high so i'll probably try 45 soon

Way too high for good traction and grip on wet roads. Unless you run a bicycle tire on your truck, no Jeep should be running pressures over about 38 (unless the High Altitude tires do)

You can't go by feel, you need to go by rubber on the road, and tire maker recommendations for that size and truck weight.
over 40 is asking for loss of traction when you really need it - loss of steering control, loss of braking. Doesn't matter how it feels.

 

[j.o.y.ride]

40 is way too high for my setup, the outside treads will start lifting from the ground causing uneven wear and less control

 

[jay21mojave]

Agree with Shadow P.. Here is the method I used to set my 35s on 8.5" wide wheels to get 27 psi cold.

 

[bd100]

no Jeep should be running pressures over about 38

Depends. P vs LT tires, size, speed, payload, etc. My old truck's manual has a table which gives a base pressure for the tire size and type, then says to add some more air pressure for highway speeds, and add more for carrying payload. Thus I ended up around 50. And those tires last forever with great traction and even wear.

And the JT's rear LT tires at 40psi were getting pretty warm at highway with trailer and cargo. I filled them to 55psi and they're much happier but still a little warmer than either the front or trailer tires. Now that we're done with the trip I think I'll let them settle to 50 during winter.

 

[dcmdon]

One option to the chalk test that we used to use when I raced was white kiwi liquid shoe polish.

It lasts a bit longer which may be better or worse depending on your situation. Its not better. Its just a different tool.

One method is to measure temperature across the tread. Back in the old days you needed a tire pyrometer, but now you can use a $20 infrared thermometer. I own one for when I make barbecue and it works well on tires also.

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