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MTRs - Pressure?
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Author:  Skyjump136 [ Sat Jul 16, 2005 3:21 am ]
Post subject:  MTRs - Pressure?
For those of you running MTRs, what pressure have you found to be best on the street?

I just put a set of 245/75/16 (load rating E) MTRs on last night and wondering what a good starting point would be.
Author:  SilverstoneXJ [ Sat Jul 16, 2005 3:59 pm ]
Post subject:  Re: MTRs - Pressure?
Skyjump136 wrote:
For those of you running MTRs, what pressure have you found to be best on the street?

I just put a set of 245/75/16 (load rating E) MTRs on last night and wondering what a good starting point would be.


Joel - How do they look mounted up? Post a pic yet?

.
Author:  lilmatty [ Mon Jul 18, 2005 5:44 pm ]
Post subject: 
I've been running 40 with no problems after 10k miles.
Author:  Skyjump136 [ Mon Jul 18, 2005 6:42 pm ]
Post subject: 
40, eh? I've got them at 33 right now, but I may give that a go. Is there a particular reason you settled on 40 (less noise, better mileage, etc)?

Thanks for the reply.
Author:  jpzkj [ Tue Jul 19, 2005 12:43 am ]
Post subject: 
Im at 40 psi also....I've run them there for the last 25K and they seem to be wearing evenly.

Best way to decide if they are over/under inflated is to chalk the tread and drive forward and see where the chalk wears off. If it's the middle...they're under inflated...sides...over inflated.

I didn't use this method of course (to much work !).....I just ran what everyone else was running .... :lol:
Author:  chefdab [ Tue Jul 19, 2005 1:52 pm ]
Post subject: 
I usually run around 38 for street driving. When I ran them at 33, my mileage was about 2mpg less. I have just under 5000 miles on them. Will be rotating at my next oil change. That is probably the most important thing to do to prolong the tire life.
Author:  Skyjump136 [ Tue Jul 19, 2005 3:01 pm ]
Post subject: 
Thanks for the responses. These tires don’t seem to look any different from 24 up to 40 psi. Generally I can look at a tire and tell from the bulge whether or not I am close on the pressure. When I bought and mounted these they had 24psi in them. Now I’m up to 40 and the sidewalls look essentially the same (virtually no bulge at all). Weird.
Author:  Tokyojoe [ Tue Jul 19, 2005 8:08 pm ]
Post subject: 
It is the strong sidewall that they have compared to most tires.
Author:  Skyjump136 [ Tue Jul 19, 2005 10:47 pm ]
Post subject: 
Yep, that's what I decided as well.
Author:  jpzkj [ Wed Jul 20, 2005 12:37 am ]
Post subject: 
The sidewall is why I dumped my BFG's for MTR's. I hated airing down and running rocks then airing up and trusting the BFG's on the highway. If you haven't noticed...im all about the beefiest...strongest...safeist.

Buy it once....thats my motto.


You can run the MTR"s at any pressure over 33 psi on the street without hurting them. I like the lower rolling resistance at 40psi. 8)
Author:  dirtykj [ Fri Jul 22, 2005 5:11 pm ]
Post subject: 
jpzkj wrote:
The sidewall is why I dumped my BFG's for MTR's. I hated airing down and running rocks then airing up and trusting the BFG's on the highway. If you haven't noticed...im all about the beefiest...strongest...safeist.

Buy it once....thats my motto.


You can run the MTR"s at any pressure over 33 psi on the street without hurting them. I like the lower rolling resistance at 40psi. 8)


When I ran 25psi on the MTR at Big Bear, boy, was it scary taking corners :) It sure felt different than when they were at, what, 40psi or thereabout.
Author:  btolle [ Fri Jul 22, 2005 9:41 pm ]
Post subject: 
jpzkj wrote:
Im at 40 psi also....I've run them there for the last 25K and they seem to be wearing evenly.

Best way to decide if they are over/under inflated is to chalk the tread and drive forward and see where the chalk wears off. If it's the middle...they're under inflated...sides...over inflated.

I didn't use this method of course (to much work !).....I just ran what everyone else was running .... :lol:


I think you may have it reversed. If the chalk wears off the middle the tire is overinflated, off the sides, tire is underinflated.

The chalk method is probably the most accurate way to find the pressure where the weight is evenly exerted across the width of the tread. Sidewall bulge, or lack of bulge, is meaningless.

Bill Tolle
04 Sahara
04 Liberty

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Author:  ltwgs [ Sat Aug 20, 2005 7:37 pm ]
Post subject: 
ran consistently at 28psi without uneven tread wear, and had a comfortable ride. I never air down for trails, either, and no KJ has smoked me on a trail yet. if you want better mpg, keep them above 32, at least. 40 should be fine. the sidewalls are so strong that it takes nearly twice the variation in psi to reap the same changes in sidewall "flex" and tread "arch."

example: to keep my KJ tires strapped down while on a u-haul car trailer, I had to air down to 5 psi. when done, I drove the sucker 1 mile (slowly) on asphalt to the gas station without hurting the tires at all...

grant
Author:  the1jferg [ Sun Aug 21, 2005 1:45 pm ]
Post subject:  hey
The tire companys told me one time that no matter the type (sidewalls) you should use factory TP.

The only time you would go higher is if you were loaded, then don't exceed max pressure

Of course you can go lower if off road. 8)
Author:  KJ02 [ Sun Aug 21, 2005 10:12 pm ]
Post subject: 
I run mine at 40 psi without problems.
Author:  KJ33 [ Thu Oct 27, 2005 7:46 pm ]
Post subject: 
However, a slightly lower tire pressure will be a smoother ride over potholes (and less time to airup at the end of the trail). TOO low though causes overheating, blowouts and death, so be careful, and keep an eye on it! :D
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