93 Probe GT Cupped tire

Went to my local Les Schwab yesterday regarding tire noise on the rear. They tell me the pass. side rear tire is cupping on the inside edge. I asked what could cause this and the answer was "bad strut". I was
wondering if this is true and if under inflation or something else could cause this? The other tires seem to be OK. The tires are Falken Bias Ply which I think may have been a mistake; but, they seem to have good tread wear.
If the rear struts need replaced can it be done just removing the strut shaft nut, or does the plate holding the strut shaft also have to be removed? The rear of the car is full of stereo gear so I can't get the side panels off easily; but, I could cut an access hole to get the strut shaft nut off.
T.I.A.
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You have bad alignment. A bad strut, spring, or tie rod end could easily cause this bad alignment. If you still have the original struts or outer tie rod ends, replace them, and then get new tires and an alignment.
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snipped-for-privacy@gmail.com says...

Had an alignment when the tires were installed. Tie rods on the rear wheels of a front wheel drive? Haven't heard of that, guess I'll have to check. I do remember the tire on that side of the car was under inflated by ~10psi. I didn't discover it until after I had driven several hundered miles, I went on a long trip the day after they were installed, but, that was several thousands of miles ago.
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FWIW... bad alignment will not cup a tire..... A bad shock or strut, out of balance or a tire just plain gone bad CAN cup a tire.
I do have a concern with the original poster saying his tires are bias ply.... While there *may* be some suppliers for reproduction type tires, I doubt that any of the "newer" players in tire supply bother with a bias ply construction and I seriously doub that any tire shop would have such a tire in an appropriate size in stock (since a bias ply would be something like a 6.50 - 15 or maybe even a G78 - 14).
Under or over inflation will have it's own particular wear characteristics.... but, an underinflated tire might also have suffered internal damage from overheating.
What we do know..... if we replace all the parts, at least one of them will be the faulty one.
If we are to give advice, we should consider it's content carefully.

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says...

I thought I heard the installer say the tires were bias ply when I asked if they were steel belted radials and he said "no". Maybe he said nylon belted? How do I check? I know they are the modern size ratings.
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Dumb question what does a cupped tire look like?! Does it baloon out looking like a big bump? anybody have any pictures
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On Sun, 04 Dec 2005 03:15:08 -0600, snipped-for-privacy@earthlink-dot-net.no-spam.invalid (fordltd) wrote:

there's a so/so picture here: www.geraldstires.com
Best way to describe it is to imagine the tire surface as water and cupped tires being a sharp edged wave "forming a slight cup". Can range in sizes
hope this helps
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says...

cups across the center. My tire place says mine is cupped on the inside edge only. Is this possible?
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Yup, entirely possible,
In the realm of vehicles virtually everything is possible, one learns this as time passes (6 defective brand new cruise control modules in a row for the same car taught me that).
As did the Caravan who's rubber rad supports would soften when hot allowing the rad to drop onto the ignition wire causing a hot running stall out, but disappearing during 90% of the driving.
Have your suspension and alignment checked, buy some good new tires. Or... if it's an older beater, say "wow, neat" keep driving, then put some other cheapies on when these wear out. :-)
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