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Old 06-19-2011, 03:02 PM   #1
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what's causing my tires to scallop?

Got some howling coming from the front of the jeep. Apparently can be caused by scalloped tires. Can you tell what's the cause by looking at the tire? Back ones look fine. Front end is fine and I think the shocks are too. I'm going to rotate, get the alignment checked and hopefully fix whatever's causing it.

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Old 06-19-2011, 03:06 PM   #2
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Camber or more specifically toe out I think, toe out usually wears like that and stays on the inside edge, just a thought.

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Old 06-19-2011, 05:39 PM   #3
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looks like cupping. Alignment and/or tie rods.

Found these:
http://www.procarcare.com/includes/c...25readtirewear.

http://www.dummies.com/how-to/conten...-for-wear.html
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Old 06-19-2011, 06:06 PM   #4
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probably mostly a toe-out problem IMHO
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Old 06-19-2011, 06:40 PM   #5
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The reason its one edge is either toe or camber. The scallop is a design of tire and lack of rotation. The heel of a tread block will always wear more than the toe, so continued excess load on the same tread blocks, you now have a nice howling tire...
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Old 06-19-2011, 11:06 PM   #6
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Dad's 05 f150 did that, ended up being the shocks.

This cracks me up from the symptom page posted above though
Quote:
Edges of front tires only worn


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Old 06-20-2011, 12:07 PM   #7
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is it lifted at all?
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Old 06-21-2011, 06:42 PM   #8
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Worn suspension parts or excessive toe IN, not out.
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Old 06-21-2011, 08:22 PM   #9
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Quote:
Originally Posted by HIVOLTJ View Post
Worn suspension parts or excessive toe IN, not out.
So tires pointing inwards, with outer edges getting excessive bite is wearing the inner edge?
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Old 06-21-2011, 08:27 PM   #10
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Quote:
Originally Posted by kd7cwg View Post
Dad's 05 f150 did that, ended up being the shocks.

This cracks me up from the symptom page posted above though
F150 might have had bad shocks, and they are notorious for edge wear because they ship from the factory out of manufacture suggested alignment spec with a SHEEEEET load of caster. Have yet to put a 2 or 4 wheel drive F150 on the rack and not have it kick out a requirement for a caster adjuster bushing...

If it were a shock issue, it would be true scallop, where you get a wear bar across the whole tire, shock issue is allowing tire to maintain excessive bounce. This is usually compounded with tires that have not had proper balance, or have not been rebalanced, so the initial bounce is the imbalance point, and the scallops are a harmonic of the initial imbalance point at a common driven speed, all freeway, 75mph, scallop is pretty small, all city, 35 mph scallop line is pretty far apart.
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Old 06-21-2011, 09:46 PM   #11
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Well, I got the alignment checked. Turned out to be pretty dead on, but they "corrected it" anyway for $60. The tech's note read "on low end of good tolerance", but when I called them on it they argued that left toe was out of spec...couldn't they have just nudged the steering wheel to fix it and still keep the right one in spec or am I thinking about it wrong?

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Old 06-21-2011, 10:02 PM   #12
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Steering wheel defiantly not zero on initial, toe just a bit tight ... looks like the MFR spec, coupled with lack of rotation damaged a set of tires. Rotate and balance every 3-5K, align every 10k. Tires aint free, between 500 to 3000. We change oil every 3 to 5 months, 3-5 miles to protect a $5000.00 to $xxxxxx.xx engine, why do people think it’s a joke when the tires sales person talks about rotations and alignments.

Tire companies want you to get a great life, and good performance out of every tire. They really do, you are their greatest, cheapest, sales asset.... friends, family, neighbor, internet. You can send more business than $100,000.00 in advertising sends.

Looks like you ignored the alignment and rotate speech.
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Old 06-21-2011, 10:31 PM   #13
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I didn't think it was a joke, but I am questioning it because of the tech's note that it was OK. I don't have a good understanding of why there's left and right specs for toe, so I was asking. You're right, I have neglected rotation.
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