different tires front and back - how bad is this? - Subaru WRX Forum
 
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#1 Old 06-03-2009, 12:20 PM
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different tires front and back - how bad is this?

Hi all (First post here )

Here is the deal - I got myself a 2006 WRX about 3 weeks ago.

It came with Kumho SPT in front (date: 2008) so I guess it is on the car for about 8 months (so did the former owner tell me). and in the back I have a pair of Kumho Ecsta dated 3807, I don't know how long they were on (say year+).

All 4 tires are same size (stock 215/45/17) and LOOK pretty much the same, they all look very good. If it wasn't AWD I wouldn't even think if changing them...

But it is...

moreover the escta treadware is 280 and the SPT are 320, so I guess more difference will be built over time...

So what do you think? how bad is it? should I run and change it right away? how "real" is this problem?
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#2 Old 06-03-2009, 02:34 PM
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You really shouldn't run different tires because of the negative effect it can have on your differentials. Your tires should be within 3/32 of an inch, but even if they are they probably won't stay that way because they have different wear rates. You probably won't kill your car to run like this for a little while but if you leave it this way you are asking for trouble.

Mosc's wheel/tire FAQ has a lot of good information on this subject, your exact question is addressed near the bottom.
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#3 Old 06-03-2009, 02:44 PM
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Isn't one of those a summer tire and the other all season? Two different wear levels? This is not good for your car, no.
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#4 Old 06-05-2009, 07:10 AM
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Ya, well did some more searching and reading and I will take the advice and change all 4 tires.

My question is: assuming the car did about 4K-6K miles on tires that were not exactly equal - how can I tell if any damage was done? I took the car to a complete check out and everything turned out perfect, of-course...

I see that different tires put "stress" on the central diff - but at what point is real "damage" done? If I get them changed quickly - I can assume that I will have no diff problems for a long period?

The car has about 24,000 miles and I guess that more than half were done on original setup. like I said - I found nothing wrong with the car. (missed anything?)
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#5 Old 06-05-2009, 12:23 PM
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change your tranny fluid and see how many chunks are in it. That'll give you a good sense of how screwed your center diff is. Although I guess if your front wheels still spin then it's still technically working.

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