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Old 12-21-2008, 06:24 AM   #1
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Tire Pressures?

I continue to have wheel wobble problems at the front between 40 and 45mph. It is not 'death-wobble' but it is still aggrivating and I am trying to find a way to dial it out. I have 33X12.5" Baja Claws on 15" MT rims. I recently had all the wheels balanced and while the problem did seem to lessen, it is still there. One interesting thing that has happened recently with the cold weather setting in is that the wobble seems to go away when it is cold (say 30 degrees or less); it comes right back when it warms up (we have f*&^%$ up weather in KY). This makes me wonder if the wobble may have something to do with tire pressure. I intend to have the front alignment checked next week but in the meantime.............
Any suggestions regarding what pressure I should be running?

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Old 12-21-2008, 08:25 AM   #2
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some guys run bigger tires lower around 28-30 psi, i'd say anything between 30 and 35 is fine. i don't think that will be your problem, it is usually tire balance with your description. lots of people will tell you it took multiple tries to get the tires balanced right. i've balanced tons of tires, and balancing 33's is hard, most of these teenagers, or immigrants that are working in tire shops don't take the time to do a really good job. start there, and watch them do it, and make sure they are all completely zero'd.

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Old 12-21-2008, 11:22 AM   #3
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^ x2

I run 30 psi on my rigs. It really sounds like an out of balance tire. I would have them balanced again by someone with experience balancing large offroad or truck tires.
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Old 12-21-2008, 04:11 PM   #4
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Realize that not all tire shops will put the effort into getting tires balanced well enough to remove all shimmy/wobble. My local Discount Tire store often requires two balancing sessions to get my 35" tires balanced so they are smooth at all speeds. I always tell the manager that I'll be back if they don't get it right as has happened in the past so he tells the guy to spend a little extra time with my tires which has been doing the trick the last year or two.

I've had to come back twice 2-3 times to get it right in the past several years alone with my 35" MT/Rs so don't assume your shimmy/wobble isn't just caused by a lame/weak balancing effort put forth by a lazy tire jock.
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Old 12-21-2008, 05:39 PM   #5
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Yeah, the 30ish PSI is usually okay but that can be a matter of personal preference, a chalk test will help dial it in. Make sure they are dynamically balancing the tires if you continue to get that annoying wobble....
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Old 12-22-2008, 04:42 AM   #6
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what would you guys suggest running 31*10.50R15 at
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Old 12-22-2008, 06:31 AM   #7
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I have 33x12.5. It will wobble with 25 psi. If I inflate them to 31 it's gone. I just aired up this weekend. Now that the cold has arrived, I noticed a tiny bit of wobble. Chenking the pressures, they were at 26-27. Back up to 31 and it's all gone.
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Old 12-23-2008, 08:56 AM   #8
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Same here after I saw this thread, I did have a slight shimmy at highway speeds. I checked my PSI and was at around 20-25 psi on all four. Aired mine up to 30 PSI and the annoying little shimmy I had is gone....My tires are 315 75R 16 Goodyear MT/Rs, Load range D.

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Old 12-23-2008, 10:12 AM   #9
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Quote:
Originally Posted by Jerry Bransford View Post
Realize that not all tire shops will put the effort into getting tires balanced well enough to remove all shimmy/wobble. My local Discount Tire store often requires two balancing sessions to get my 35" tires balanced so they are smooth at all speeds. I always tell the manager that I'll be back if they don't get it right as has happened in the past so he tells the guy to spend a little extra time with my tires which has been doing the trick the last year or two.

I've had to come back twice 2-3 times to get it right in the past several years alone with my 35" MT/Rs so don't assume your shimmy/wobble isn't just caused by a lame/weak balancing effort put forth by a lazy tire jock.
I echo Jerry's statements.. I will only deal with Discount/Americas Tire just for that reason.. The guys I work with ALWAYS put in the extra effort to make sure everything jives.. I was so appreciative of their extra efforts on my last experience where they installed my snow tires; I surprised the whole crew with coffee and doughnuts.. They love it when you do that.

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Old 12-24-2008, 09:49 AM   #10
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I surprised the whole crew with coffee and doughnuts.. They love it when you do that.

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ya buddy, if you have a good mechanic, and you want to make your mechanic happy, the easiest thing to do is bring some food, pizza, doughnuts, something to show you appreciate the service. make sure the guys in the shop get it, not just the office folk. you will be treated well forever. my favorite thing is for customers to bring food to say thanks.
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Old 12-24-2008, 11:27 AM   #11
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i keep my 31x10.5s at 25 psi. some say this is too low, but i find for this size MT it is the best pressure for optimum balance btwn wear and ride.....just my .02

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