1981 Cherokee

[cu4whln]

CU What is the water test? I did drop them down to 25lbs as per your comment, so thank you. As you could imagine going from 45 to 32 was a huge improvement.

Water Test:

On a dry day, on dry pavement, put a roughly 2 foot area of water.

Then: drive the front tire through it slowly.

Look at the wet tread mark coming out the other side.

Try this at 35, 30 and 25 psi.

Evaluate each tire contact patch. Try to get all the center tread to contact if possible.

This gives you a good idea of how much of the tire is actually contacting the road. You want a fair amount of the tread in contact with the road.

Now, this is a "general" quick check. You should drive the Jeep a bit to ensure it feels normal.

(Also, reference the original stock tire pressure listed for your Jeep. (This is a good reference for a stock tire size.)

Note: Larger than stock tires have higher load capability.


Why do this?

Many of the truck tires we run are "E" rated for higher max loads - i.e. strong, stiff sidewalls. .
( "C" rated tires have softer sidewalls and are generally "car" tires btw )

If you look at the sidewall, tires have a max capacity listed on them. ( Maximum weight the tire "could" bear )

Usually, this is much higher than any one corner of our Jeeps could weigh.
While this is not unusual, total load capacity is often way too high.

Example: 33" load range "E" tire: Each tire is rated @ 3200 lbs. 3200 x 4 corners = 12,800 lbs.

As a general rule, these loads are about 1 1/2 the rated GVW of our vehicles.
So if GVW of our Jeeps is 5,500 lbs fully loaded, max tire loading would be targeted at roughly 8,250.

This is a general target, and often this max weight of tires is slightly higher.


General Result:

Tires and pressures play an integral part of a vehicles ride quality.

If possible, it is better for ride if you can find a "C" rated tire.
A softer sidewall will result in a better ride.

Sidewalls get "stiffer" with higher tire pressures, resulting in a stiffer ride.


For off road use? Often it is more desirable to get the stiffer/stronger "E" rated tires.
Why? To help prevent sidewall damage while during off road use.

[rang-a-stang]

Water Test:

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Why do this?
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General Result:

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This is GOLD!! I just printed it up and am going to hang it in my garage!

[78 WIDETRAC]

Finally some welds on the floor pans.[url=https://ibb.co/tmqXLgj][/url[url=https://ibb.co/5cgdLmT][/url

[rang-a-stang]

Those look great! Nice job, Dave! Keep going!!!