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Old 11-19-2008, 11:49 AM   #1
Snow Drift
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Default 3 used Snows + 1 New Snow = Shave? Where? Or?

Hey, I had 3 snow tires that only had part of a season on them, and I sold them. Now I could get them back for a good price.

Long story short, if I buy a new one, the height will be different, so...

Where could I get it shaved?
Or
What other option do I have?
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Old 11-19-2008, 11:59 AM   #2
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You could buy 2 new ones, put them on the front and put 2 of the old ones on the rear. Then you'd have a spare. Keep in mind some tire places wont mount them for you that way as they assume most people are idiots and will spin like a top with less traction in the rear.
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Old 11-19-2008, 12:45 PM   #3
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I believe according to Subaru's allowable tolerances between tread depth, if you have 3/32nds or less between tires, the AWD will be ok.
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Old 11-19-2008, 12:48 PM   #4
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out of curiosity, anyone know how long it would take to screw up the awd system with mismatched tires?
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Old 11-19-2008, 01:47 PM   #5
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on the rears if u have a viscous ltd slip diff, it can be just a relatively few miles. the bigger the diameter disparity, the more the rear VLSD converts the "slip" to heat and the quicker it cooks. a friend flatted on his RS, mounted the donut spare, drove like 50 miles and had to stop because a passerby told him there was a fire underneath his car. bye bye diffie-doo!

mismatches front to rear accelerate wear/tear on center diff.

short answer: el cheapo mismatched tires are a bad deal. either spend the $ for good tires, or spend $$$$ on towing and diff replacements. (or give up on awd and just get a honder...youse kin run anyole tires on them, long as the 2 fronts are same)
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Old 11-19-2008, 01:50 PM   #6
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Quote:
Originally Posted by MYfirst00 View Post
I believe according to Subaru's allowable tolerances between tread depth, if you have 3/32nds or less between tires, the AWD will be ok.
I thought they measured it in total circumference difference, and it was a tiny about, like a 1/4 inch. I'll have to look it up.

I've never heard of any place that will shave snow tires (even new). That's one of the drawbacks of owning awd cars.
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Old 11-19-2008, 02:42 PM   #7
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have someone throw it on their FWD car and do burnouts until desired tread depth...
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Old 11-19-2008, 02:49 PM   #8
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^^ Ftw! Haha!
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Old 11-19-2008, 02:50 PM   #9
Snow Drift
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Thanks guys. I think I'll just pick up 4 new ones or keep looking for used. I'm too paranoid for the 3+1 deal.
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Old 11-19-2008, 03:45 PM   #10
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I used tirerack to shave a tire I ordered and I believe it was $30 if I recall to do that.
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Old 11-19-2008, 03:57 PM   #11
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Quote:
Originally Posted by __raj View Post
I used tirerack to shave a tire I ordered and I believe it was $30 if I recall to do that.
But how do you figure out the exact measurement?
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Old 11-19-2008, 04:18 PM   #12
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I had the same problem when I got my car (01 OBS). My car was used and had a small cut in the sidewall of one of the tires. The Toyota dealer who I bought the car threw on a brand new RE92 and left the other 3 (which had like 18K on them) I called multiple Subaru dealers to find out if this was OK. they all said something else. 1 said I MUST replace all of them. The second said that they will be fine as long as they're the same tread pattern and 15inch tires. the the last dealership said that it depends on your driving style and if you tend to drive on the highways or side streets. Subaru's site give specific specs on the variation of tire sizes and what and what is not acceptable. In my case I just ran the set with the 1 new one and for like
10K miles and while they weren't ready to be replaced just yet, they were getting bald a bit and it was the start of the snow season so I ditched them and got a new set.

I decided to be non-lazy and look it up; here we are direct from Subaru.com (and as stated before, tires must be within a 1/4 in size).

http://www.subaru.com/common/faq/tech_info.jsp#2

"Do I have to replace all four tires on my AWD Subaru?

All of the tires on your AWD Subaru must be within 1/4 of an inch of rolling circumference (part that touches the road). This is because of our All Wheel Drive System.

Proper rotation of the tires at the appropriate service intervals will increase the life expectancy of your tires. This will also ensure that all four tires stay relatively equal in their tire tread wear. When vehicles are serviced, tires should be routinely checked to ensure that the alignment and tires are in good working condition. "

Last edited by jetfan2207; 11-19-2008 at 06:04 PM.
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Old 11-19-2008, 04:31 PM   #13
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Put the better tire on the front. Front is an open differential and should make the least difference.

End of story.
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Old 11-19-2008, 08:09 PM   #14
Snow Drift
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Quote:
Originally Posted by Nate8409 View Post
Put the better tire on the front. Front is an open differential and should make the least difference.

End of story.
Even on the 08's? It's no longer the same AWD system. Now it's got VDC incorporated into the system.
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Old 11-19-2008, 08:13 PM   #15
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according to Luke (tirerack.com), up to 3/32" diff. is acceptable on Subaru.
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Old 11-19-2008, 08:17 PM   #16
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Originally Posted by txl146 View Post
according to Luke (tirerack.com), up to 3/32" diff. is acceptable on Subaru.
Hey are they on here? What username?
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Old 11-19-2008, 09:07 PM   #17
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Quote:
Originally Posted by Snow Drift View Post
But how do you figure out the exact measurement?
An independent garage did it for me. But I believe they measured the circumference around the center line of the three good tires and averaged it together.
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Old 11-19-2008, 09:11 PM   #18
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Quote:
Originally Posted by txl146 View Post
according to Luke (tirerack.com), up to 3/32" diff. is acceptable on Subaru.
That is a huge difference to what SOA is saying. SOA's guideline is crazy, normal wear could exceed that tolerance.
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Old 11-20-2008, 09:15 AM   #19
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Quote:
Originally Posted by Snowphun View Post
That is a huge difference to what SOA is saying. SOA's guideline is crazy, normal wear could exceed that tolerance.
I disagree that 3/32" is "normal wear" unless you don't rotate your tires frequently enough. A new tire is only 11/32" in tread depth. 3/32" over 11/32" is over 25% wear between the same set of tires.
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Old 11-20-2008, 09:44 AM   #20
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3/32" isn't SOA's tolerance, .25" of total circumference is. Big difference.
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Old 11-20-2008, 09:51 AM   #21
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Quote:
Originally Posted by Snowphun View Post
3/32" isn't SOA's tolerance, .25" of total circumference is. Big difference.
Do you mean 0.25" of total diameter or circumference? Cause if you mean circumference I'm going to call shenanigans. The circumference is 79" on a 205/55-16 RE92, and a quarter inch is 0.3% of the total circumference.
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Old 11-20-2008, 01:06 PM   #22
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The VDC wont care at all. Just read this here and it will show you what VDC is all about. http://www.cars101.com/subaru_terms.html#VTD

The AWD system is the same. It just has a computer that works with the ABS module to activate each brake individually and uses inputs from the steering angle sensor and throttle postion to try and get the car going straight again.

In other words this system only will activate during loss of traction. The chance is very minimal that the system will detect the difference in the tire sizes.

How many miles are you going to clock on your Suby this winter?

Nate

Quote:
Originally Posted by Snow Drift View Post
Even on the 08's? It's no longer the same AWD system. Now it's got VDC incorporated into the system.
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Old 11-20-2008, 03:05 PM   #23
Snow Drift
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Quote:
Originally Posted by Nate8409 View Post
The VDC wont care at all. Just read this here and it will show you what VDC is all about. http://www.cars101.com/subaru_terms.html#VTD

The AWD system is the same. It just has a computer that works with the ABS module to activate each brake individually and uses inputs from the steering angle sensor and throttle postion to try and get the car going straight again.

In other words this system only will activate during loss of traction. The chance is very minimal that the system will detect the difference in the tire sizes.

How many miles are you going to clock on your Suby this winter?

Nate
I get an oil change almost every month. So 2-3,000 miles per month.

I think i'll just buy 4 new tires. which sucks b/c I had the tires last winter but one got a bubble so now all of them are worthless to me.
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Old 11-20-2008, 03:36 PM   #24
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Quote:
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Hey are they on here? What username?
Luke@TireRack(.com?)
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Old 11-20-2008, 03:50 PM   #25
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Quote:
Originally Posted by MYfirst00 View Post
Do you mean 0.25" of total diameter or circumference? Cause if you mean circumference I'm going to call shenanigans. The circumference is 79" on a 205/55-16 RE92, and a quarter inch is 0.3% of the total circumference.
Refer your shenanigans to post 12.
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