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Old 01-19-2013, 07:46 PM   #1
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Mud tires over 70 mph...

...Is it reasonable to expect an occasional vibration over 70? Doesn't always happen, so I'm perplexed... maybe it's just the right road conditions combined with climate conditions? Who knows...

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Old 01-19-2013, 07:52 PM   #2
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its reasonable to expect something that large spinning that fast to vibrate. that being said, have them balanced. mud tires generally need to be balanced more often than street tires. my 33" Federals shake like crazy at 70, but for some reason everything above 90 is smooth as glass.

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Old 01-19-2013, 08:24 PM   #3
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That's wild...lol
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Old 01-19-2013, 08:25 PM   #4
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No problem, here.
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Old 01-19-2013, 08:58 PM   #5
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Yep
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Old 01-19-2013, 10:46 PM   #6
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I guess it's no big deal
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Old 01-20-2013, 12:46 AM   #7
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305/70/17. (34s). No vibration whatsoever. On a newer Jeep I'd question why there would be any vibration with a new tire- MT or not. If on a newly installed lift it could be other issues. By vibration (here it goes) I assume you mean a shimmie/left to right shake? On the 91 freeway here my Jeep feels like a freight train- but its the crappy concrete pavement full of divets. I wouldn't call it vibration- more like a spinal shake out.
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Old 01-20-2013, 04:55 AM   #8
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Old 01-20-2013, 07:16 AM   #9
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You may just be hitting your resonance region. Your tires can't be balanced for every RPM. I work with turbines, and one style had a resonance region of about 2/3s rated speed. Another had 1 at about 1/4 and another at 1/3 and one at about 2/5. In all cases we are to accelerate quickly thru without exceeding our limits, but out side those regions we could sit as long as we need to for trouble shooting. But the end goal was to get it to design for making electricity. I can't go it much more detail about my turbines since it is classified.
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Old 01-20-2013, 07:41 AM   #10
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Quote:
Originally Posted by smaxberry
You may just be hitting your resonance region. Your tires can't be balanced for every RPM. I work with turbines, and one style had a resonance region of about 2/3s rated speed. Another had 1 at about 1/4 and another at 1/3 and one at about 2/5. In all cases we are to accelerate quickly thru without exceeding our limits, but out side those regions we could sit as long as we need to for trouble shooting. But the end goal was to get it to design for making electricity. I can't go it much more detail about my turbines since it is classified.
Would the RR speed change depending on tire size ?

From what I read and experience tires vibes usually show at 50-60
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Old 01-20-2013, 09:28 AM   #11
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balancing beads. They work.
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Old 01-20-2013, 09:36 AM   #12
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Quote:
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Would the RR speed change depending on tire size? From what I read and experience tires vibes usually show at 50-60
Bigger tire = fewer revolutions per unit distance/time = higher resonance speed.

Heavier tire = slower period of momentum per given spring rate = lower resonance speed.

Stiffer spring = faster period of momentum = higher resonance speed.

There is a combination of tire/wheel weight, tire size, and spring rate that deliver the most comfortable ride. Most manufacturers aim for that comfort zone, which ends up making the resonance speed around 50mph. Once you throw after-market springs/wheels/tires into the mix, it may drift higher or lower.
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Old 01-20-2013, 09:53 AM   #13
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I don't get any vibration with mine. Make sure your pressure is at 37 and have them re-balanced.
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Old 01-20-2013, 02:42 PM   #14
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Quote:
Originally Posted by C.L.

Bigger tire = fewer revolutions per unit distance/time = higher resonance speed.

Heavier tire = slower period of momentum per given spring rate = lower resonance speed.

Stiffer spring = faster period of momentum = higher resonance speed.

There is a combination of tire/wheel weight, tire size, and spring rate that deliver the most comfortable ride. Most manufacturers aim for that comfort zone, which ends up making the resonance speed around 50mph. Once you throw after-market springs/wheels/tires into the mix, it may drift higher or lower.
X2

Many thing can affect your RR. Rebalancing should be considered after changing anything from the axel out.
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Old 01-20-2013, 04:07 PM   #15
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I've run 3 different 33" tires on 2 different sets of wheels on 2 different JKUs...and I have always had vibrations at times. Especially above 55 MPH.
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Old 01-20-2013, 07:13 PM   #16
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Quote:
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I don't get any vibration with mine. Make sure your pressure is at 37 and have them re-balanced.
37... Lol... that's insane...c'mon dude
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Old 01-20-2013, 07:13 PM   #17
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I run at 30 psi
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Old 01-20-2013, 11:02 PM   #18
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balancing beads. They work.
Hmmm....please elaborate.
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Old 01-20-2013, 11:14 PM   #19
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^ I tried them with my first set of tires. Hard shimmy at 45
Some people say they work great, others not so much.
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Old 01-20-2013, 11:21 PM   #20
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I'm the OP... drove over 70 today, no shake/shimmy... who knows...
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Old 01-20-2013, 11:48 PM   #21
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I think it has a lot to do with wheel size too. I had vibrations with 33's on 15" wheels but never had vibrations when I ran 33's on 17's
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Old 01-21-2013, 04:32 AM   #22
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Hmmm....please elaborate.
Tire Balancing Products
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Old 01-21-2013, 05:39 AM   #23
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its reasonable to expect something that large spinning that fast to vibrate. that being said, have them balanced. mud tires generally need to be balanced more often than street tires. my 33" Federals shake like crazy at 70, but for some reason everything above 90 is smooth as glass.
The problem is, you're trying to get to 90 by going through 70. Easy solution is to bypass 70 all together.

Best way I've found to do this is by air drop out of a C-130. The 130 has more than enough power to get your Jeep up to 90 so anything larger is really just a waste of fuel.....I mean do you really need a C-17 or C-5 to get up to speed?
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Old 01-22-2013, 06:13 AM   #24
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The problem is, you're trying to get to 90 by going through 70. Easy solution is to bypass 70 all together.

Best way I've found to do this is by air drop out of a C-130. The 130 has more than enough power to get your Jeep up to 90 so anything larger is really just a waste of fuel.....I mean do you really need a C-17 or C-5 to get up to speed?
yes, but i know from personal experience that you can fit 5 MH-60S in a C-17, thats at least 10 jeeps. MASS JEEP AIRDROPS
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Old 01-22-2013, 06:21 AM   #25
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I have 35s and no shake or shimmy at any speed so far for me in 10k miles. Have you tried that same stretch of road a few more times? I thought I was feeling a little shake on one stretch of road but a few more trips produced the same result. Crazy part is the left lane is the rough one, the right lane is smooth.
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Old 01-22-2013, 06:21 AM   #26
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Thats why I miss the retired C-141….. I think it is more fitting for our needs in this thread.
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Old 01-22-2013, 08:09 AM   #27
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I have a similar problem. On concrete roads I can go up to 75 mph with no vibration. Once I hit smooth asphalt roads the vibrations start between 65 and 70.

First time it happened I thought something had come loose, so I pulled over on the side of the highway. Nothing obvious.

I did notice my right rear tire has a ton of balancing weights on the inside. I think that's the culprit.
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Old 01-23-2013, 12:28 PM   #28
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you don't say what kind of mud tires... I still have stock tires on my rubicon, and routinely do > 80 and have no issues with shake, shimmy, rattle or roll

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