Calgary Jeep Association

Author Topic: offroad tire pressure?  (Read 6227 times)

0 Members and 6 Guests are viewing this topic.

Offline Vinman

  • CJA Executive
  • Talks waaay too much!
  • Posts: 2237
Re: offroad tire pressure?
« Reply #15 on: March 31, 2010, 08:18:21 PM »
seeing as how its a 245/75r16, stock size,

  Quoted from the OP:  I have 35 MTR's
/l ,[____],
 l---L -OlllllllO-
 ()_)-()_)-o-)_)

Quote from: Bnine link=topic=25904.msg162940#msg162940      date=1341881306

 Resident prick is my job and it took me ten years to earn that title

Offline hps4evr

  • Administrator
  • Talks waaay too much!
  • Posts: 2959
Re: offroad tire pressure?
« Reply #16 on: March 31, 2010, 08:22:49 PM »
i meant to quote the guy that resurected this post.
YJ=Y’all Jealous

Offline dac

  • That CB Yapper
  • Posts: 516
Re: offroad tire pressure?
« Reply #17 on: March 31, 2010, 08:28:00 PM »
seeing as how its a 245/75r16, stock size, i think going to single digit pressures could cause a tire to come off the bead much easier then a wider/taller aftermarket tire. 245's are pretty skinny..........

I recall reading on the goodyear page that the stock rubicon rubber was good up to a 7.5" wheel?  I see the new MT/R's are good to 8".  For what it's worth.


I've been running 12ish psi in my 33's on a 8" wide wheel.  Seems to work well for me.
This is not 'Nam, this is wheeling.  There are rules.

Offline Vinman

  • CJA Executive
  • Talks waaay too much!
  • Posts: 2237
Re: offroad tire pressure?
« Reply #18 on: March 31, 2010, 08:59:09 PM »
i meant to quote the guy that resurected this post.

LOL, I didn't even notice how old the original post was.

Vince
/l ,[____],
 l---L -OlllllllO-
 ()_)-()_)-o-)_)

Quote from: Bnine link=topic=25904.msg162940#msg162940      date=1341881306

 Resident prick is my job and it took me ten years to earn that title

Offline Slewfoot

  • UberWheeler
  • Posts: 304
Re: offroad tire pressure?
« Reply #19 on: March 31, 2010, 09:23:32 PM »
LOL, I didn't even notice how old the original post was.

Vince

lol - what can I say...search works  ;D
2006 Rubicon LJ (Unlimited) Mostly Stock

Offline dac

  • That CB Yapper
  • Posts: 516
Re: offroad tire pressure?
« Reply #20 on: April 01, 2010, 08:45:51 AM »
Well my '04 Rubi has 8" rims from the factory... so I'd hope that the factory tires were good to 8". Perhaps they spec'd narrower for the newer ones?


The new MTR's are recommended for 6.5-8" wheels.  I' read on the goodyear page a while back the old MT-R's were only recommended up to 7.5".  I can't see the extra half inch wider than recommended wheel being a bad thing if they are fully inflated??

http://www.4x4review.com/Reviews/ProductReviews/TiresandWheels/GoodyearWranglerMTR/tabid/441/Default.aspx
LT245/75R16  116P  OWL  6.5- 7.5  30.7  9.7  "3,042" 

I'd use it as an excuse to go bigger though :)
This is not 'Nam, this is wheeling.  There are rules.

Offline SwampSinger

  • CJA Members
  • Talks waaay too much!
  • Posts: 6172
  • Baconator
    • mmmmm-bacon
Re: offroad tire pressure?
« Reply #21 on: April 01, 2010, 12:22:48 PM »
I ran my 35" MTR's on 8" rims (non beadlock) at 8 psi when wheeling, never once had a bead pop.

It's because you drove your Jeep like an old French lady Vince  ;D


My Pitbull Rocker starts working well at 4psi... but I poped a few beads at 8psi without bead locks. I guess my old French lady driving is not as good as Vince. :P

Offline Vinman

  • CJA Executive
  • Talks waaay too much!
  • Posts: 2237
Re: offroad tire pressure?
« Reply #22 on: April 01, 2010, 02:28:19 PM »
It's because you drove your Jeep like an old French lady Vince  ;D


My Pitbull Rocker starts working well at 4psi... but I poped a few beads at 8psi without bead locks. I guess my old French lady driving is not as good as Vince. :P

I backed my Jeep further through trails than you'll ever drag that little station wagon :o
/l ,[____],
 l---L -OlllllllO-
 ()_)-()_)-o-)_)

Quote from: Bnine link=topic=25904.msg162940#msg162940      date=1341881306

 Resident prick is my job and it took me ten years to earn that title

Offline SwampSinger

  • CJA Members
  • Talks waaay too much!
  • Posts: 6172
  • Baconator
    • mmmmm-bacon
Re: offroad tire pressure?
« Reply #23 on: April 01, 2010, 03:00:19 PM »
at 65 year old, you have a few years on me ... I understand

Hows your Jeepathfinder Vince? ;D



Offline Vinman

  • CJA Executive
  • Talks waaay too much!
  • Posts: 2237
Re: offroad tire pressure?
« Reply #24 on: April 01, 2010, 03:08:41 PM »
at 65 year old, you have a few years on me ... I understand

Hows your Jeepathfinder Vince? ;D

the last time I saw 65 was 1865...

It was a Jeepxterra and was replaced with a JeepTundra.

I do have a 7 slot, open top 4x4 in the garage, I'll have to hook up on a run if you ever get the grocerygetter runnin' again



/l ,[____],
 l---L -OlllllllO-
 ()_)-()_)-o-)_)

Quote from: Bnine link=topic=25904.msg162940#msg162940      date=1341881306

 Resident prick is my job and it took me ten years to earn that title

Offline SwampSinger

  • CJA Members
  • Talks waaay too much!
  • Posts: 6172
  • Baconator
    • mmmmm-bacon
Re: offroad tire pressure?
« Reply #25 on: April 01, 2010, 03:24:23 PM »
I have not unloaded the last load of grocery since the Jeep has been in the shop  for the last 6years... Thanks God it's canned  goods and diapers. Don't mind the best before date when you get your stuff Vince.


PS: sorry about the confusion on the Jeepoyota/ Jeepissan


Milan might come over to my newly built  garage for a cold one....I do have a few at room temperature for you. I know it's hard on your stomach  ;).

Cheers Bud

Offline hps4evr

  • Administrator
  • Talks waaay too much!
  • Posts: 2959
Re: offroad tire pressure?
« Reply #26 on: April 03, 2010, 08:47:40 PM »
Thanks God it's canned  goods and diapers.

diapers???  Dom must have a leaky valve... are they pull-ups or depends?
YJ=Y’all Jealous

Offline Milan

  • CJA Members
  • UberWheeler
  • Posts: 488
Re: offroad tire pressure?
« Reply #27 on: April 05, 2010, 09:33:30 AM »
First...35" MTRs start working at 8psi as Vince said. 5-6 is better for more traction. 4 even works well in snow. Anything lower and they get too mushy but hey some of us like that. Below 8 you do have to watch the beads a bit. Of course new tires act differently than broken-in ones, I like to run low pressures first to break them in and after while you can use a bit more psi with enough sidewall flex.

Second, I did see Vinny go backwards quite well few times. The Jeep would always take Vince "where he wanted to go".  Some say he's a damn good driver. I say the Jeep was way more capable than the monkey behind the steering wheel. ;)  :P  ;D Isn't the 7 slot machine just a go-cart Vince? I'm sure it is. But I bet it's faster and more economical than my Jeep  :'(

Third, typical Czech Lager like the Original Budweiser (now called Czechvar), not the crap sold here, or any decent beer should usually be served at 7 deg C. Anything cooler than that kills the taste. The only time I'll drink an ice cold beer is if its 30+ and I'm on a beach by the ocean somewhere or in the desert. I may even put a slice of lemon in the one called Corona as it's more like a lemonade anyway. Lemon or anything else in any other beer ruins both the lemon or whatever and the beer. Only people that don't understand beer put anything in it. Proper Lager or Pilsner style beer is a meal on it's own, no fruits or veggies necessary.  ;) And you're on for a cold one in your garage. Maybe this week?? I'll give you a call.
« Last Edit: April 05, 2010, 09:36:14 AM by Milan »
Keep on Jeepin'

Offline Slewfoot

  • UberWheeler
  • Posts: 304
Re: offroad tire pressure?
« Reply #28 on: April 06, 2010, 10:59:17 AM »
Hi,

I'm running BFG Mud-Terrain T/A KM2 on a stock '06 Rubicon.  Tire size is 245/75R16 and I believe the rims are 8 inches wide.  The tires have 3-ply sidewalls and BFG brags about the sidewalls being one of the toughest and puncture/tear resistant out there.

From what I read earlier in this thread, it looks like I'd be OK to run them at 15 psi.  At the last Open Run (my first), folks suggested 20 psi, and hinted that going lower is risky.  From what I read here, it looks like the risk isn't much higher at 15 psi than at 20.

Does 15 psi sound reasonable for my current setup?

The answer:  No - not for this tire/rim combination.
I was running 15 psi this weekend. On the driver's side, both tires got roots or twigs driven/stuck between the rim and tire (and couldn't be removed), and the front tire ALMOST broke the bead (I could put my finger between the rim and tire bead...then I realized putting my finger there was a bad idea so I used a small stick to scoop the mud out instead). 32 PSI put the bead back in place.

I don't recall any driver side impacts or slides so I'm not sure where the beads slipped/opened up.

I think the tires are just a tad too narrow for the rim width (or rim too wide for tires) for 15psi.  I think I'll try 17 next outing and see how that goes.  I really liked the traction at 15 psi though...I don't recall slipping even once on the rocks.
2006 Rubicon LJ (Unlimited) Mostly Stock