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Old 11-17-2013, 07:13 AM
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Cupped or Out Of Balance?

Hi All,
I've had a shimmy in my steering wheel since rotating my back tires to the front, but it only happens at 60 mph give or take three mph. They are stock MT's with about 35K on them.

Thanks!

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Old 11-17-2013, 07:19 AM   #2
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Most likely out of balance. If they were cupped you could visually see it.

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Old 11-17-2013, 07:25 AM   #3
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Most likely out of balance. If they were cupped you could visually see it.
Yes. Have they been re-balanced in their 35K use? If not just the tire wear in 35K can throw them out of balance in many instances. Especially in an aggressive tire pattern.
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Old 11-17-2013, 07:40 AM
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They have not been rebalanced. I just found a $20 coupon for rotation and balance, so I'll try it today. I think the local shop has a road force machine.

I'll report back for closure!
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Old 11-17-2013, 08:51 AM   #5
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They have not been rebalanced. I just found a $20 coupon for rotation and balance, so I'll try it today. I think the local shop has a road force machine.

I'll report back for closure!
Good idea. I would also suggest visually inspecting the tires for cord separation as well.
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Old 11-17-2013, 09:28 AM   #6
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A shimmy is usually a tire out of balanced. Balancing them should take care of the shimmy.

As daggo66 already mentioned, you can see cupping and many times you can also hear it. My original BFG KM1 MTs were prone to cupping and I had one tire in particular that became very loud because of it.
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Old 11-17-2013, 09:52 AM
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Quick question: is road force balancing worth it? Local shop doesn't have machine, but one's close- it'll cost me more, though.
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Old 11-17-2013, 10:13 AM   #8
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Quick question: is road force balancing worth it? Local shop doesn't have machine, but one's close- it'll cost me more, though.

YES. Without a doubt....
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Old 11-17-2013, 10:23 AM   #9
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Quick question: is road force balancing worth it? Local shop doesn't have machine, but one's close- it'll cost me more, though.
Be careful, I brought mine in for a road force balance. He was done and asked about all the weight on 2 wheels. His response " we would have to road force and match mount" and "it cost more"
I asked for a dam roadforce and understood it cost more. He did not have time to break down the tires.

My point... Road force is only ad good as the tech running the machine. Also it's a separate process. He used the machine as a normal balancer.

But yes ... Done right RF is the only way to go. They can determine if a wheel or tire is beyond being able to be balanced.
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Old 11-17-2013, 10:29 AM   #10
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If you have a discount tire close by they will set you up.
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Old 11-17-2013, 11:10 AM
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The road force shop quoted me $80 and couldn't guarantee anything since the tires are a bit worn. Since I'm only about six months away from replacements, I decided on the $20 coupon special for regular. Guy tested before balancing and said they were definitely off, so I'm hoping this fixes my problem for the meantime.

I've got 38K on them, and two are in great shape, but two are going to need replacing in spring.
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Old 11-17-2013, 01:03 PM   #13
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You can always try beads
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Old 11-17-2013, 01:22 PM
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Looks like the basic balance worked- no shimmy at any speed. Glad I didn't blow the $80!
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Old 11-17-2013, 05:46 PM   #15
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Looks like the basic balance worked- no shimmy at any speed. Glad I didn't blow the $80!

Good to hear.
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Old 11-17-2013, 09:16 PM   #17
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good info

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