Tire pressure makes huge difference in ride quality

[RCH]

Is the Tazer pretty safe for a non-techo guy to operate? (example: does it have a "return to factory settings button" for when I set something bad by accident?)
Rhinebeck01: Thanks for sharing all your experience. I will research the Tazer.

v/r rch

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[wibornz]

^^^^^Yes, when you unmarry the Tazer, it puts the stock programming back in the Jeep.

I run 37X12.5 r17 STT PRO tires. When they are cold, I air to 26 psi and as they warm up, they go to 28 psi. This is what I use for every day driving. When out on the trail, I air down to 8 psi. This makes the trail a super smooth ride. I also run a quality beadlock wheel. If you are not running beadlocks, you should stay closer to 15 psi. I am in Michigan, and most of the trails are sandy and rutted with chatter bumps. At 8 psi, is nice a smooth. The 37 inch tires have plenty of sideway and my speeds are slow.

As for the TPMS alert, I disable the TPMS system when airted down with the Tazer. That way I don't have the annoying light on.

As a side note, Michigan roads are some of the worst in the US. If I was running my tires at 37 psi, it would beat the life out of my JLUR. There are roads that lead into Lansing Michigan, that are in such bad condition, I will not drive our car on them and I drive out of my way to so I can avoid them.

Picture of what my tires look like at 8 psi on the trail so you have an idea of the low air bulge with them.

 

[RCH]

Wibornz, those look like bead locking rims on the lead jeep. Only way I would have nerve enough to air down to 8 is if I had bead locks on them. Great Picture. Looks like a perfect day.

v/r rch

 

[wibornz]

Wibornz, those look like bead locking rims on the lead jeep. Only way I would have nerve enough to air down to 8 is if I had bead locks on them. Great Picture. Looks like a perfect day.

v/r rch

The lead Jeep is mine. I have ATX Slab Beadlocks. It was a perfect day. There was about 20 Jeeps and we did 40 or so miles on the trail. We stopped along the way and pulled out a couple grills and grilled burgers and hotdogs in an opening on the side of the trail. There was a ton of food, cookies, cake, chips, veggies, There was no way we could have ate al ofl the food. We hit the trail about 10 am and finished up about 6 pm. Great day it was.

 

[anotherWS6]

I put 60lbs n my e rated 35 Duratracs on my 2000 Silverado 7 years ago cuz that's what othe folks in my family ran and it was still ower than listed max pressure. HOOOOOOly Hey-sus! It was stiff. Did a couple of chalk tests that showed me 45 was much better so aired em to that and left em for awhile. Still a very bumpy ride and after awhile I saw that the middle treads were wearing significantly faster. I widdled down the pressure over time to about 28-29 pounds cold. Much better ride and wear. That was in a 5,500lb truck. I towed with it and also took over 1,500lbs of junk to the dump in the bed multiple times without airing up with no issues.

FYI - Higher tire pressures are technically "safer". I believe that;s why the factory specs are so high. It's a lot harder to blow a tire off of a rim at 40 pounds than it is at 12, but it's still seems pretty damn hard to do on an e-rated tire running high 20's psi.

 

[KananagaS]

What would be the best pressure for E rated 285/70-17? My tire guys told be don’t go lower than 40psi, they filled with 44psi at the beginning. Now I am at 40psi with some wondering above 80MPH.

 

[roaniecowpony]

^^^^^Yes, when you unmarry the Tazer, it puts the stock programming back in the Jeep.

I run 37X12.5 r17 STT PRO tires. When they are cold, I air to 26 psi and as they warm up, they go to 28 psi. This is what I use for every day driving. When out on the trail, I air down to 8 psi. This makes the trail a super smooth ride. I also run a quality beadlock wheel. If you are not running beadlocks, you should stay closer to 15 psi. I am in Michigan, and most of the trails are sandy and rutted with chatter bumps. At 8 psi, is nice a smooth. The 37 inch tires have plenty of sideway and my speeds are slow.

As for the TPMS alert, I disable the TPMS system when airted down with the Tazer. That way I don't have the annoying light on.

As a side note, Michigan roads are some of the worst in the US. If I was running my tires at 37 psi, it would beat the life out of my JLUR. There are roads that lead into Lansing Michigan, that are in such bad condition, I will not drive our car on them and I drive out of my way to so I can avoid them.

Picture of what my tires look like at 8 psi on the trail so you have an idea of the low air bulge with them.

As the size of the tire gets larger, the ability of the tire to support higher weight goes up, at the same pressure. Another way to say it is: you have to lower pressure when installing a larger tire, if you want to maintain the same spring rate of the smaller tire.

For those seeking softer rides, just be careful. Lowering the pressure also changes the steering response and tread stability (sway). If you lower the pressure you give up some of each of those characteristics. It's possible to make the handling bad enough to be a problem in emergency situations if you go too low on the pressure.

 

[sourdough]

I had 37" "D" on JLR and been running 28 cold. Now I swapped to 35" "C" and wondering a liile less or more PSI. I've only driven 20 miles on the new tires which are at 30 cold from D.T.

 

[OnlyOne]

I went to a C 37 and run like 34 instead of the 28 I was running in my D’s. Same ride. Glad I went with the Cs this time.

 

[Jeep Dude]

I went to a C 37 and run like 34 instead of the 28 I was running in my D’s. Same ride. Glad I went with the Cs this time.

That's what I'm running on my D 37's as well. 28 psi cold.

I'm almost tempted to try 24 as a daily on ashphalt lolll

Yeah, 3 years after the fact, in retrospect, unless you are carrying heavy gear, eauipment around on a daily basis, and/or running on some really nasty, rock crawling sharp rock type of trails, that require a more stout and particularly solid sidewall, yeah D's suck loll, never again.

 

[JAF1]

I had 37" "D" on JLR and been running 28 cold. Now I swapped to 35" "C" and wondering a liile less or more PSI. I've only driven 20 miles on the new tires which are at 30 cold from D.T.

I have BFG 315 70R-17s on factory rims with 11k miles running at 31psi. Using a tread depth gage the wear had been even across the entire width.

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