Tire Pressure

[Mason1]

Need some advice please,
I have seen similar conversations on this subject, but not my current issue. Just went to 35x12.5x15 tires on my CJ7 . Using 15x10 rims, I am down to 20 psi and the tread still does not meet the pavement at 100%. Looks to be an inch of tread on both sides will not touch the pavement. How low in pressure should go and be safe on the road? Trying to get an even tire wear.

Thank you everyone
Mason1

 

[HackFabrication]

Welcome to the forum!!!

You are running a tire that was designed for a heavier truck on a light vehicle. It's going to be difficult to get a good 'tread contact patch'.

IMHO 20 psi is too low to be running on paved roads at highway speeds. I run 34-36 psi on my 32x11.50-15 TSL/SX tires on the streets. That seems to be the best ride, but I haven't really done a lot of experimenting either.

 

[Mason1]

How much of your tread hits the road at any given time?

 

[Lumpy Grits]

:ww:

To much tire for the weight carried.

Also-10" is a bit 'thin' for 35" tires.
FWIW: I run 33's on 8" wide at 25-26psi with no issue.
I would run at least 22-24psi in those 35's.
LG

 

[Posi]

I run 20lbs on road, but as LG mentioned it's all about the weight and tire manufacture. When it came to my motorhome I weighed the front and rear axles separately on a scrap yard scale and went by the tire manufacturers weight and PSI chart.

 

[Mason1]

20 psi has a "spongy" ride. I will air up to 25 tonight, will see how it rides.

Thank you everyone for the replies..

 

[Lumpy Grits]

How's about posting up the details of your Jeep here.
https://www.jeep-cj.com/database/

Would like to see some pictures also.

LG

 

[daddyusmaximus]

To much tire for the weight carried.

This could be the case. Some tires are made with a stronger construction to carry a heavier load. What brand, and model of tire?

10" is a bit 'thin' for 35" tires.

I don't get this part... How is a wheel width "thin" for a diameter? For most 35x12.50s a 10" wide wheel is ideal. I ran this size on an 8" wide wheel (on a much heavier truck) but did so just to help the bead stay on when aired down, and to keep it tucked under the fenders on a daily driver. The wider 10" wheel should allow the tire to flatten out better than a narrow 8" wide wheel. I'm thinking the tire is built to handle more weight than the little CJ.

 

[BusaDave9]

But here is how you can find the correct pressure for your jeep: Take some chalk and draw a line across the tread, from the inside of your tire to the outside. Drive a few blocks. If you wear off the chalk evenly then the tires are at the correct pressure. If you wear the outer edges first then you have too little pressure. If you wear the inner part of your tread off first then you have much pressure.
You could do the same test with masking tape but you would have to drive further to wear it off.

https://www.jeep-cj.com/forums/f49/tire-pressure-6358/

 

[Lumpy Grits]

Many folks I've seen w/35's where I wheel run 12". Or at least, that's what they tell me.
LG