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Old 12-03-2008, 06:51 PM   #1
Aspenbullet
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Default Very uneven treadwear. Pics inside.

I get my car aligned usually once a year at the Subaru dealership. Can anyone shed some light on why the treadwear would be so uneven on only the passenger side of the car (front and rear tires look almost the same). The tires wear much more evenly on the drivers side. My summer tires showed the same strange treadwear pattern too.

Passenger side front tire:


Close up of the outside of the front passenger tire:


Close up of the inside of the front passenger tire:


Driver side front tire:


I'd like to get this straightened out before I buy and ruin a set of new winter tires.

Thanks in advance!

Matt
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Old 12-03-2008, 07:16 PM   #2
EdHilario
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Negative camber wear?
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Old 12-03-2008, 07:26 PM   #3
chimchimm5
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Looks like something is causing dynamic toe on the passenger wheel, which makes the (slight?) neg camber an uneven wear issue. Dynamic toe can be caused from play in the wheel: worn hub bearings, worn suspension bushings, bent arms, unevenly worn struts left/right, etc.

Jack up the front, get a firm grip on the passenger wheel and see if there's much play.

I had a similar problem with a previous car. Align specs were great, etc. But the unevenly wearing tire got that way I think with braking... ABS kept activatng just on that wheel; suggesting "low traction"... even though it was straight braking. Never got it solved though before the car got sold.
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Old 12-03-2008, 09:58 PM   #4
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Quote:
Originally Posted by EdHilario View Post
Negative camber wear?

research before posting
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Old 12-03-2008, 10:17 PM   #5
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Quote:
Originally Posted by EdHilario View Post
Negative camber wear?
WRONG-O...guess again

_______________________________________

OP....get the toe set to '0' and be
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Old 12-04-2008, 12:58 AM   #6
pnutbutta
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like stated above likely a toe issue. also make sure to regularily check your tire pressures!
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Old 12-05-2008, 12:27 AM   #7
Aspenbullet
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Quote:
Originally Posted by chimchimm5 View Post
Looks like something is causing dynamic toe on the passenger wheel, which makes the (slight?) neg camber an uneven wear issue. Dynamic toe can be caused from play in the wheel: worn hub bearings, worn suspension bushings, bent arms, unevenly worn struts left/right, etc.

Jack up the front, get a firm grip on the passenger wheel and see if there's much play.
Ok, so there's no play in the wheel when I grab the wheel at 12 and 6 and wiggle it. I do hear a strange creaking/squeaking coming from the rear of the car when I go over speed bumps or drive into my garage up a 4 inch step up. I guess that noise could indicate worn suspension parts but the noise is only from the rear of the car.

To pnutbutta:

I do check tire pressure every time I fill up the car so I don't think that's an issue.

Uncle Scotty:

So I would just ask the dealership to set the toe to 0 on the passenger side wheels only?

I guess I should have them check for any damage to suspension parts on that side while I'm at it. I have a feeling if I ask the dealership to look for damage, they'll find some.
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Old 12-05-2008, 01:20 AM   #8
dubya-R-ex
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Fat passenger changing the alignment of your car?
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Old 12-05-2008, 01:26 AM   #9
Aspenbullet
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Originally Posted by dubya-R-ex View Post
Fat passenger changing the alignment of your car?


I'm glad it's the passenger side with the uneven wear and not the drivers side.
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Old 12-05-2008, 06:28 AM   #10
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Have them set 0 toe on ALL tires.

Some in the motorsports say you have to take the axle nut off to really let the hub/bearing move enough to show if it's bad. I think it was dunk who had a bad bearing and until he did that the usual 12/6 test didn't work at all.

What are your alignment specs anyways?
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Old 12-05-2008, 08:36 PM   #11
EdHilario
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Quote:
Originally Posted by grippy monkey View Post
research before posting
Quote:
Originally Posted by Uncle Scotty View Post
WRONG-O...guess again

_______________________________________

OP....get the toe set to '0' and be
lol...the inside of the tire was worn so it wasn't a bad guess. Hence the question mark after my post.

The intranets r serious bizness!! rawrarar
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Old 12-05-2008, 08:50 PM   #12
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A guess is not something you really want to throw out on something like this. Camber almost never causes a wear issue on impreza based vehicles unless you never do anything but go in a straight line or turn only at parking lot speeds.
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Old 12-05-2008, 09:26 PM   #13
Aspenbullet
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Quote:
Originally Posted by Daishi00 View Post
Have them set 0 toe on ALL tires.

Some in the motorsports say you have to take the axle nut off to really let the hub/bearing move enough to show if it's bad. I think it was dunk who had a bad bearing and until he did that the usual 12/6 test didn't work at all.

What are your alignment specs anyways?
I can't seem to find the alignment specs but AFAIK it's set to factory specs since it was taken to the dealership.

Do Subaru factory alignment specs on a 2002 WRX call for the toe to be set to 0 on all tires?
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Old 12-05-2008, 09:46 PM   #14
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Quote:
Originally Posted by Aspenbullet View Post
I can't seem to find the alignment specs but AFAIK it's set to factory specs since it was taken to the dealership.

Do Subaru factory alignment specs on a 2002 WRX call for the toe to be set to 0 on all tires?
'factory' specs are garbage

and a 'green' alignment---all the arrows in the 'green' on the alignment screen... is the easy way for the tech to get paid for doing nothing.


specify '0' toe and it doesnt have to be exactly '0'....but >.05 is what ya want

max neg camber up front--whatever they can get ...even side to side
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Old 12-06-2008, 11:18 AM   #15
recnelis
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Quote:
Originally Posted by Aspenbullet View Post
I can't seem to find the alignment specs but AFAIK it's set to factory specs since it was taken to the dealership.

Do Subaru factory alignment specs on a 2002 WRX call for the toe to be set to 0 on all tires?
The alignment specs should be in your factory manual. They are for my RS.

If you want to double check the work the dealership did, you could always try out the alignment thread in the suspension forum. With strings running parallel to the car, you can get a pretty good measurement of toe. If it's off, you can go yell at your dealership or fix it yourself. If it's good, then it might be something else.

My dad's RS had a similar looking wear pattern on his tires. When we finally checked it with the strings, we found about 3-4 mm of toe out on the worst wheel. The factory specs are supposedly +/- 3 mm (which is why being "in the green" or "factory spec" is not necessarily zero).
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