Hey, I Got My New Shoes On

"Justino6969" (justino6969)
09/27/2016 at 21:20 • Filed to: None

Well, looks like I had to get some new tires sooner than I thought. The current ones were losing about 5psi a day all around. I could have had them remounted and sealed hoping that would fix the issue, but it needed two new ones anyway, so why not.

Good news; I installed a new steering damper last night and after the alignment today, the death wobble is completely gone. Hooray!

So what pressure do you think I should run them at? They’re rated at 50psi (BFGoodrich All Terrain T/A KO2), but since the Jeep is so light I was thinking around 35? Opinions? It will mostly see highway use.

Also, I need to name her.

Yes, I will be using a digital tire pressure gauge.

DISCUSSION (18)

jkm7680 > Justino6969
09/27/2016 at 21:23

Looks nice!

Justino6969 > jkm7680
09/27/2016 at 21:26

Thanks!

If only EssExTee could be so grossly incandescent > Justino6969
09/27/2016 at 21:26

whoarder is tellurium > Justino6969
09/27/2016 at 21:28

Nice tire choice.

On the topic of steering, I fear the steering box on my ZJ is worn out. Ugh.

Daily Drives a Dragon - One Last Lap > Justino6969
09/27/2016 at 21:31

I still haven’t figured out a name for my car yet so....

JeepJeremy > Justino6969
09/27/2016 at 21:32

Damn! Looking strong!!!!

Urambo Tauro > Justino6969
09/27/2016 at 21:33

Don’t go by the max rating on the tire. Pressure should be listed on a tag somewhere on the vehicle, not sure where on Jeeps.

Or you could do the chalk test:

Start with a good alignment and a ballpark guess tire pressure. Use chalk (or paint, whatever) to draw a line across the width of the tread. Drive it, and see how the chalk wears. Try different pressures until the chalk wears evenly. That’s how your tires will wear.

Justino6969 > whoarder is tellurium
09/27/2016 at 21:33

Thank you! I’m surprised at how smooth this one is. For 145,000 miles and oversized tires, the steering is super light and precise.

Justino6969 > JeepJeremy
09/27/2016 at 21:34

Thank you! Let’s hope she’s as capable as she looks!

Justino6969 > Urambo Tauro
09/27/2016 at 21:35

I was thinking of doing the chalk test. Some forums I’ve perused say to keep around 32-35 for street use, but I thought I would get an opinion anyway. Thanks for the advice!

Jordan and the Slowrunner, Boomer Intensifies > Justino6969
09/27/2016 at 21:50

I run around 40 on my 4Runner with 33x12.50, though it weighs around 4200.

Justino6969 > Jordan and the Slowrunner, Boomer Intensifies
09/27/2016 at 21:52

I think I’m leaning towards 35 with my curb weight of 3600. Thanks for the input!

Jordan and the Slowrunner, Boomer Intensifies > Justino6969
09/27/2016 at 21:54

It should be fine, I’ve ran 36 before and it was okay.

HammerheadFistpunch > Justino6969
09/27/2016 at 22:22

run the rated pressure unless they are E rated, then run a little higher.

gogmorgo - rowing gears in a Grand Cherokee > Justino6969
09/27/2016 at 23:38

The only way to establish the correct tire pressure is through testing. Run the identical course a bunch of times with as few variable changes as possible, and average the lap time. Then adjust the tire pressure and do it again. If you see gain in lap times, continue adjusting in that direction. When it starts getting worse, go back the other way in smaller and smaller increments. With a digital gauge, you can even go by half-psi or less. Eventually you’ll find the sweet spot where you have the most grip.

Or you could be boring and concerned about even tire wear and do the chalk-line thing.

Tristan > Justino6969
09/27/2016 at 23:45

With 33x10.50 BFG ATs on my XJ, 25 seems to be the magic number. Any less is too wobbly, any more and it rides like a dump truck. Your results may vary.

You can tell a Finn but you can't tell him much > Justino6969
09/28/2016 at 09:27

The proper tire pressure should be on a sticker on the drivers side door jamb. If not it is definitely in the manual, which you should be able to find online if you don’t have a copy of it. Run the car manufacturer recommended pressure. I cannot emphasize this enough. Run the tire pressure that the car manufacturer recommends.

The number on the tire sidewall is pretty much irrelevant (unless your vehicle recommends a higher pressure than the tire sidewall).

MontegoMan562 is a Capri RS Owner > Justino6969
10/27/2016 at 17:08

Just seeing your posts about the XJ.

We’re running about the same size tire on our lifted Commander, we went with Cooper Discoverer AT/3's they’ve been great. The T/A KO2's are a solid choice though!

Wr keep our Coopers around 35-36, they hysterically have a limit of 70 or something. My dad was helping me mount them and he yelled across his shop, whats the max PSI on these? What should I put it to. I said- sidewall says 70...lets not do that. hahaha