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Old 07-11-2005, 09:01 AM   #1
AWD_n00b
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Default Tire replacement question (AWD)

I have an 04 STi, bought is used a few months ago, and it is my first AWD car.

So I got a huge nail on the side of my tire, it can not be repaired, and must be replaced.

The 3 good tires have 10,000 miles on them.

I bought a used tire from a local shop, same as OEM tires, but it has less mileage, about 5,000.

My car now pulls to the right hard. Is this because the tire wear is eneven?

Which brings me to my question. Do AWD cars need all 4 tires replaced at same time? Do I need to replace all 4 tires?

Thanks
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Old 07-11-2005, 09:18 AM   #2
DetroitWRX
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Quote:
Which brings me to my question. Do AWD cars need all 4 tires replaced at same time? Do I need to replace all 4 tires?
Yes you should. Some times you can have a tire cut to the same depth on the old ones to match.

I would put it on the drivers front and take some off ramps a the limits to scrub some off then switch it to the rear. If you plan to keep the tire.
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Old 07-11-2005, 05:01 PM   #3
armand1
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Quote:
Originally Posted by AWD_n00b
...I bought a used tire from a local shop
this can be tricky, because it's hard to tell what condition the tire is in.

Quote:
My car now pulls to the right hard. Is this because the tire wear is eneven?
Whatever is causing it, it is *not normal*. The shop you bought the tire from should stand behind their sale. If they can't fix the problem (e.g. by "shaving" the tire to match the tread depth of your other 3 tires), then they should refund your money. Of course, this assumes that the wear on your other 3 tires is even and that there isn't any suspension problem.

A separate issue is that if the difference in tread depth between the most worn and least worn tires is 2/32" or more, the AWD mechanism will be overstressed and could eventually be damaged. This is also why it is important to rotate your tires front<->back every 3-5000 miles.
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Old 07-11-2005, 05:54 PM   #4
STIgeorge
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There is a certain tolerance that the tires' circumferances must be within as compared to each other, I forget the exact measurement, but it should be easy to find in a search of the tire and wheel thread.

If the circumferances don't match, damage to the differentials will occur.
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Old 07-11-2005, 06:04 PM   #5
armand1
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Originally Posted by STIgeorge
There is a certain tolerance that the tires' circumferances must be within as compared to each other, I forget the exact measurement, but it should be easy to find in a search of the tire and wheel thread....
Or you could just look at the post above yours. 1/32" tread depth difference is OK, 2/32" difference is too much.
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Old 07-11-2005, 06:19 PM   #6
STIgeorge
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NINJA EDIT!

That wasnt there when I posted.

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Old 07-11-2005, 06:29 PM   #7
Samirr76
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You cant go by tread depth, as different tires start out with different tread depths. Some tires look bald when they are new. You have to go by rolling circumference. All four tires must be within 1/4" rolling circumference of each other.
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Old 07-11-2005, 06:56 PM   #8
STIgeorge
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But wouldn't the same brand/model tire have the same starting tread depth, thereby having the same rolling circumference? He's not puting a different brand/model of tire on.
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