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Unread 04-22-2002, 10:59 AM   #1
Dtray332
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Tire inflation charts

I have a 1986 CJ7. I just put a 4 inch lift and 33-1250/15 Super Swamper TSL Radials on it. When the tires were mounted (3 days ago), they aired them to max inflation. I'm looking for a Tire load VS inflation chart. Kinda tired of getting my teeth rattled already. Thanks for any help.

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1986 Renegade CJ7, 258 straight 6, 4 inch Pro Comp lift, 33 inch Super Swampers (TSL Radial), Double Trail Master steering stabilizer, cool set of aircraft seat restraints.
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Unread 04-22-2002, 11:32 AM   #2
4wheeler4CJ
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Without seeing a chart, i can give you an idea where you should be for street driving. I had 31x12.50's on my last CJ7, and used to run them at about 25psi. I think max was 35. The larger the tire, the less pressure needed to inflate it to the right shape. You could easily start at about 25psi for street (your being 33's), and use trial and error to work from there. My tires wore perfectly even across the tread, and rode very comfortably.
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Unread 04-22-2002, 11:35 AM   #3
Bulletproofcj7
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I found the best way to get your ideal air pressure is to load up the jeep with everything you would normally carry when on the pavement.(commuting etc.) Take a crayon or piece of chalk and color a thick line across the tread on atleast one front tire and one rear if not all four,(the front vs. rear pressure will be different due to the weight of the engine) now drive down a paved road for say 100' or so,just enough for the chalk line to start wearing out, Notice where it wears the most, in the center or the sides, if it wears in the center let some air pressure out until that line wears evenly. If it wears off the sides you need to add more pressure until it wears evenly.
You will probably want to drop the pressure considerably depending on the degree of wheeling you do. There are too many variables to be able to take numbers off the chart. like the type of vehicle, sidewall stiffness of different tires,and gear that you carry, winches etc.
I am running about 24psi in the rear and 26 in the front with my 33" goodyear mtr's, 8 cyl and glass body.
hope this helps.
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1982 cj7. Frame off. shell valley kevlar body, stainless hinges, Bestop seats and supertop, KC titanium lights, Homemade swing out tire carrier with spare front wheel bearings/hub, Built 304,DUI,Edelbrock shorty headers with dual stainless 21/2 tubes into incynerator cans 21/4 dumped out the back,Edelbrock 600cfm, performer intake and cam, Borgeson lower column, Centerforce clutch, NV-4500, Dana 300 w/custom built twin stick, Homade 1/4" steel skid plate, 2.5 soft ride w/ 1" shackle lift, 33x12.5 mtr's. Stainless fuel and brake lines, Braided hoses. more...
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Unread 04-22-2002, 01:03 PM   #4
4wheeler4CJ
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Bulletproof, what gears are you running with your 33's? I have to check mine still to see what they are, in case they have been changed along the line somewhere, before I get my 33's.

How do you like the MTRs?
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Unread 04-25-2002, 06:51 AM   #5
Bulletproofcj7
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I think i have either the 3:31 or 3:54, cant remember right now, they are ok in low range and first but id like to slow it down some. with the t-5 the jeep never sees 5th gear need to be going faster than 65 so it doesnt sound like it wants to stall. should be perfect with 4:10's.
The mtr's re great, good in the mud and i walked the jeep with no lockers (yet) right up a steep wet rough rock climb. as far as road noise, i think that they have a little humm to them but its hard to tell with the exhaust that im running.
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1982 cj7. Frame off. shell valley kevlar body, stainless hinges, Bestop seats and supertop, KC titanium lights, Homemade swing out tire carrier with spare front wheel bearings/hub, Built 304,DUI,Edelbrock shorty headers with dual stainless 21/2 tubes into incynerator cans 21/4 dumped out the back,Edelbrock 600cfm, performer intake and cam, Borgeson lower column, Centerforce clutch, NV-4500, Dana 300 w/custom built twin stick, Homade 1/4" steel skid plate, 2.5 soft ride w/ 1" shackle lift, 33x12.5 mtr's. Stainless fuel and brake lines, Braided hoses. more...
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Unread 04-25-2002, 02:04 PM   #6
4wheeler4CJ
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Yeh, I'm still debating either the BFG MT/KM or Goodyear MTRs. Really can't decide, LOL!

I'm running the T-18A behind my 360, so if I do have the "misfortune" of having higher gears like that, I probably will still be ok (3 highway gears, 1 granny gear). I am guessing I probably have 3.54s, but I want to be sure, you never know the history of one of these machines, LOL!
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Unread 04-25-2002, 06:28 PM   #7
Bulletproofcj7
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careful with those BFG MT's they are a great tread design but the sidewall is kind of thin, i went through a couple of 35" on my 1 ton gmc because of slashes in the side wall, this is the main reason i went with the MTR's, they claim to have a heavy duty (duragaurd) side wall.
A friend of mine (Gkirbs) just put a set of 33" procomp X-terrain on, they are very quiet on the road and must be good off road(havent had a chance to test them yet)
Testing the New Goodyear Wrangler MT/R
<a href="http://www.outdoorwire.com/4x4/reviews/gymtr99/index.htm" target="_blank">http://www.outdoorwire.com/4x4/reviews/gymtr99/index.htm</a> <a href="http://www.outdoorwire.com/4x4/reviews/gymtr99/index.htm" target="_blank">web page</a>
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1982 cj7. Frame off. shell valley kevlar body, stainless hinges, Bestop seats and supertop, KC titanium lights, Homemade swing out tire carrier with spare front wheel bearings/hub, Built 304,DUI,Edelbrock shorty headers with dual stainless 21/2 tubes into incynerator cans 21/4 dumped out the back,Edelbrock 600cfm, performer intake and cam, Borgeson lower column, Centerforce clutch, NV-4500, Dana 300 w/custom built twin stick, Homade 1/4" steel skid plate, 2.5 soft ride w/ 1" shackle lift, 33x12.5 mtr's. Stainless fuel and brake lines, Braided hoses. more...
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Unread 04-26-2002, 06:09 AM   #8
4wheeler4CJ
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Yeh, I hear good things about the X-Terrains, they are almost exactly a Mickey Thompson Baja Claw, but cheaper.

I wouldn't mind them, but wouldn't want to have to carry 2 spares, LOL <img border="0" title="" alt="[Wink]" src="wink.gif" />
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