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Old 12-15-2007, 12:26 PM   #1
formula91
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Default Do I need to replace all 4 tires? (Sort of urgent I guess)

I recently got my front-right tire damaged, and when I got it to the shop for repair, they said it was pretty much unrepairable due to the fact that there are three separate punctures in the tire. Just what the heck did I run over?

Here are my specs:

2005 2.5 RS with Sport Package - 4EAT
Stock Everything except for tires.
The tires are Kumho Ecsta ASX UHPAS on the stock wheel.
They've been driven on for 8000 miles or so.

If I got new Kumho Ecsta tire onto my car, would this hurt my differentials?
Would there be a significant difference in the tire radius that it would start messing up my AWD system? (And therefore ultimately costing me much more than four tires)

Of course, I wouldn't be asking this question if I absolutely had the money to replace all four tires... I would just go ahead and replace all four. (with something I like better XD) But unfortunately I don't exactly have the resources to do so. (I mean on a whim like that)

So, tire experts and AWD technicians... Do I need to replace all four tires?

It's snowing here and I want to get this over with. My car is crying because it's running on a spare and FWD....
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Old 12-15-2007, 01:15 PM   #2
leecea
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Measure the tread remaining on the others and see if the difference will be within spec (can't remember what that is). Also note that TireRack will shave a new tire to match the existing ones. With only 8K on the other 3, I'd suggest trying to keep them.
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Old 12-15-2007, 01:32 PM   #3
Back Road Runner
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I doubt 8k miles is significant treadwear.
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Old 12-15-2007, 08:02 PM   #4
iyzmi
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Why would you want tire rack to shave your new tires? 8k miles isn't very much, just replace the one tire you need with the same size as the others and you'll be fine. I don't really understand what you're talking about when you ask if a new tire will mess with your AWD system...how? The tire isn't going to be much shorter at all after 8k miles. You wouldn't even be able to measure the difference probably.
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Old 12-15-2007, 08:30 PM   #5
formula91
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Default

Thanks guys for the replies.

In reality I had the same thoughts as you guys, however, I have very little confidence in my own logic and therefore wanted to check with you guys first.

If tirerack does indeed shave tires down, that is great. I'll keep that in mind.

I've been using those tires rather aggressively as well, but I don't think there's much of a tread difference either...

Mmm I guess I'll just put on the tires. There's more stress on the differentials when I'm turning probably. XD
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Old 12-15-2007, 09:29 PM   #6
iyzmi
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Get a new tire and don't worry about it. I would seriously be surprised if you had any problems down the road because of 1 tire having slightly more tread than the rest.
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Old 12-16-2007, 02:13 AM   #7
formula91
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Thanks guys, you put my mind to rest.

Scoob Noob out =)

---

Edit, you probably are hearing that Chicagoland (and maybe Milwaukee too) is getting a lot of snow. This is the worst time to have a flat. I'm missing the best subaru days.... =(
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Old 12-16-2007, 08:58 AM   #8
martinus
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Can't really recomend one or the other, with out an actual tread depth measurment. ( buy a gauge its ONE $ . ) I really dont want to be the " uninformed keyboard-tech " and recomend something that could cost you waaaaayyyyyyyy more in the future than a set of tires ...

8K doesnt seem like a lot, but how many awd burnouts does that include ??? LOL.
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Old 12-17-2007, 01:54 AM   #9
ballitch
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I think I read somewhere, sometime that the awd system can handle 1/4'' of tire circumference. So 1/4'' = 6.35mm divide that by 3.14 and you get about 2mm. so 1mm of tread depth difference is no big deal. But thats just what I read somewhere around here. but now that I think about it....1 mm tread depth really isnt alot.



~Josh~
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Old 12-17-2007, 06:11 AM   #10
formula91
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Quote:
Originally Posted by ballitch View Post
I think I read somewhere, sometime that the awd system can handle 1/4'' of tire circumference. So 1/4'' = 6.35mm divide that by 3.14 and you get about 2mm. so 1mm of tread depth difference is no big deal. But thats just what I read somewhere around here. but now that I think about it....1 mm tread depth really isnt alot.



~Josh~
That somewhere I have discovered after you mentioned this fact (I did a little searching too) is actually the Subaru Maintenance Manual. I found it while messing around on my MySubaru.com account.

So keep that in mind guys.

PS By the way, it is actually pretty useful for logging your maintenance and miles and such. It increases your online odometer automatically depending on how many miles you drive a year.

Also wouldn't it be easier to just measure the circumference with a tape measure rather than buying a tread measure? At least that what the manual says to do. (which I know is cheap, but it takes time to buy one )
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