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Old 04-24-2009, 10:15 AM   #1
dauss
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Default What causes tire cupping?

So I got my tires balanced last week and the tech said that my tires were cupped, mainly on the passenger side of the car. I got them balanced after 8000 miles, and they were brand new Goodyear Eagle F1-DS G3.

A friend said that my struts might be blown. I have Koni Sport shocks with STi Pink wagon springs. I jacked up the car, pulled off the wheel, and looked at the shocks. No hydraulic fluid anywhere. Any other way to check to see if they're blown?

Another friend said it just might be my alignment. I'll just got an alignment 1 week ago and I can post up my before and after numbers when I get home. I have Whiteline 22mm FSB and their 24mm RSB.

Thanks,
David
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Old 04-24-2009, 12:58 PM   #2
Uncle Scotty
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bad alignment

ya want '0' toe

a blown strut may cause this as well....or damaged suspension
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Old 04-24-2009, 02:43 PM   #3
dauss
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Can they still be driven on or toss them and get a new set? They have 6/32nd's tread left on all 4.
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Old 04-27-2009, 09:49 PM   #4
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I'd check your alignment numbers. If toe is off would cause uneven wear. You might as well keep the tires till there totally out of tread then buy a new set and get a correct alignment.

Edit: I was thinking feathering not cupping.
TurboL is correct.

Last edited by Subydude81; 04-27-2009 at 10:53 PM.
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Old 04-27-2009, 10:42 PM   #5
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alignment wont cause cupping. Cupping is from the tire striking the ground harder at one spot. bad struts will cause random cupping all over the tire. An out of balance tire will cause cupping in one or two spots. You could also have a damaged tire. Ask for a road force balance and see if they can match the tire to the wheel.

ive seen BAD struts that never leak. good way to tell if they are bad is to jounce the suspension. It should go down, and come back up. Thats it. If it does that like 2-3 times, your struts are weaksauce.

Last edited by turboL; 04-27-2009 at 10:51 PM.
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Old 04-28-2009, 11:21 AM   #6
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After checking and finding out your alignment is ok, which you did, (you didn't say if any corrections were made) I'd just put the fronts on the back. They should be fine. They may make noise, but should wear down flat. (eventually) RP
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Old 04-28-2009, 07:02 PM   #7
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Here's some diagrams that might help out.

http://tireguides.com/print_friendly...tails&ttcid=10
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Old 05-10-2009, 08:10 AM   #8
dauss
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Quote:
Originally Posted by drivin blind View Post
After checking and finding out your alignment is ok, which you did, (you didn't say if any corrections were made) I'd just put the fronts on the back. They should be fine. They may make noise, but should wear down flat. (eventually) RP
Sorry it has taken so long for me to get back to this thread. So the suspension has a lot of mods. 22mm adj. Whiteline FSB set @ 22mm, 24mm adj. Whiteline RSB set @ 24mm, Kartboy Endlinks, Koni Inserts, STi Pink wagon springs, Group N "STi" Strut mounts(front and rear), GT-SPEC rear tower brace, Whiteline steering rack bushings.

I do mostly highway driving, and I put on about 23,000 miles a year.
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Old 05-10-2009, 12:20 PM   #9
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your toe should be fine now, there's not a lot, there was a bit before which was probably what was causing the cupping. I'd keep an eye on it though the next little while. If the cupping is particularily bad you can flip the tires on the wheels so it's on the outside of the wheel.

Are the tires directional or can they rotate either way? If they're not directional you can flip the cupped ones to the other side of the car and see if the ones that are fine get cupped again, but if both tires were having issues on the one side, it's not really a strut issue.

You ever hit a pothole hard or anything hard on the driver's side? caster is off just at tiny bit...
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Old 05-10-2009, 06:15 PM   #10
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Quote:
Originally Posted by Sir-Knight View Post
You ever hit a pothole hard or anything hard on the driver's side? caster is off just at tiny bit...
Yes, an especially nasty pothole destroyed my driver's front suspension. Had to get a new wheel, control arm, strut, strut mount, control arm, fender liner, and a few other things.
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