Last post on Nov 27, 2013 at 1:06 PM
You are in the Subaru Crew
What is this discussion about?
Subaru Impreza, Subaru Outback, Subaru Forester, Subaru Legacy, Coupe, Sedan, Wagon, SUV
Go to NHTSA to file a safety complaint.
Or call Monday-Friday (8 am to 8 pm ET) (888) 327-4236 TTY: (800)424-9153
Your Community Leaders are ateixeira and rsholland.
#3868 of 19336 AWD, uneven tire wear...4 new tires
Sep 22, 2004 (12:17 am)
This is a cross post that I posted on AWD VW forum, but unable to find it here.
I went to costco to replace 1 tire on my 1994 subaru awd impreza and got "buy 4 tires" thing, because of 4/32" uneven wear. They now won't sell anything but 4 new tires on awd, even though we JUST bought a single tire from them a few months ago. This must be a new-ish policy as we've bought 1 and 2 tires in the past. So I did a little research and found this on tirerack.com
C:\Documents and Settings\Administrator\Desktop\Tire Tech - Matching Tires on Four-Wheel Drive And All-Wheel Drive Vehicles.htm
Audi As published in their vehicle owner's manual, "rolling radius of all 4 tires must remain the same" or within 4/32-inch of each other in remaining tread depth.
Porsche Cayenne within 30% of the other tire on the same axle's remaining treadwear.
Subaru Within 1/4-inch of tire circumference or about 2/32-inch of each other in remaining tread depth. (although NOT in my owner's manual)
So thoeritically I can get 3 tires, only if Costco sells the EXACT same style of Potenza's that I got a few months ago. Bummer, cuz 2 are only 50% worn.
The BIG question, has anyone actually ruined a transmission....or are they trying to con us out of more money? Also the AWD on a manual is different than an automatic. Does anyone know if this makes a difference? Thanks-jewels
#3869 of 19336 Re: AWD, uneven tire wear...4 new tires [jtom]
Sep 22, 2004 (2:56 am)
Jewels- Yes you can buy just 3 new tires since the 4th is only a couple of months old and yes it sucks that you have two that are only 50% worn.
As to your "big" question... not that I know of. No doubt the tolerances specified are extremely conservative (as specified by the legal dept). It's not a con since it's the auto manufacturers who make the rules and they don't sell tires. Now here's a big question for you: are you willing to risk ruining your AWD to find out?
Sep 22, 2004 (3:49 am)
I have frequently replaced 2 tires only on my 4EAT Subes with no problems though I am not one to wear them down to the legal minimum before changing. While there is a noticeable difference in tread depth between the replaced ones and the ones I kept on the car I've never had a situation where there are 2 new ones and 2 with only 2-/32 only! It may be more of a problem with the MT as its always in 50:50 mode.
#3871 of 19336 This might be more than you are willing to do....
Sep 22, 2004 (4:39 am)
but many speed shops and some better tire stores have equipment for shaving a tire. A popular thing with the racing community, as it avoids the squirm common with brand new rubber.
Buy the tires over the counter (not mounted, so you don't have to state the application), get them trimmed to match the remaining units, and have the speed shop mount and balance them.
#3872 of 19336 Do a full-size spare
Sep 22, 2004 (6:10 am)
How many months is a "few" months?
You can have a small variation, up to 1/4" circumference (right guys?) from tire to tire. Your few months old tire might fall within that tolerance.
You know what I'd do?
Get 4 new tires, one new rim, make the few months old tire your new full size spare.
As a matter of fact, I have a spare 15" rim laying in my garage and you can have it if you pick it up. It's black, 6" wide, Subaru offset. Almost brand new off our 2002 Legacy L.
Sep 22, 2004 (6:26 am)
We all know that owning an AWD vehicle cost a bit more. Extra purchase price, a little more maintenance cost (not much), potentially higher repair cost, and increased gas consumption. Tires are another "potential" category. Yes, you should absolutely keep your tires within similar circumferance and always the same tread pattern, even if it means purchasing an entire set versus just one or two. It's one of those extra costs so you can gain the superior handling of AWD no matter the weather conditions.
Here's something to think about: Did your tires come from the same manufacturing lot? A number of years ago I had a set of very nice Michelin's mounted on my Accord, and after 30,000 miles those 60,000-mile tires totally wore out...except for one. It still had half tread life. I had rotated those tires every 5,000 miles. Just out of curiosity I checked into it, and come to find out, that one tire was from a different manufacturing lot. No problem on a FWD car in that case, but it could have been with any of my current AWD vehicles. Now I ask that all the tires come from the same lot when I make a new purchase.
#3874 of 19336 How much work is involved in replacing the Knock Sensor?
Sep 22, 2004 (8:28 am)
I got the part from the dealer, and on my way to the shop, but unable to do so today, just curious, how much work is involved in installing the sensor? Thanks
#3875 of 19336 Re: How much work is involved in replacing the Knock Sensor? [john284]
Sep 22, 2004 (10:41 am)
It is visible from the drivers side, on the upper deck, tucked under the intake manifold. One connector and a bolt and it is out. But I could imagine that getting a tool and your hands in there could be tight.
#3876 of 19336 Re: AWD, uneven tire wear...4 new tires [p0926]
Sep 22, 2004 (1:39 pm)
hey, thanks everyone for such great and fast replies. I bought it at costco here in Hawaii(potenza re900), hope they still have them. A couple of months (I was gone this summer, so only a couple thousand miles on the one tire) should be alright. I think it measured 9/32, new is 11/32, I think. Anyhow, I may get Michelin replacements, the Bridgestones do seem to wear out quick for me. This time, I WILL rotate! thanks again edmunds.com folks.
#3877 of 19336 Re: Engine Light On Climbing Mountain Passes [vetmats]
Sep 22, 2004 (3:28 pm)
I forgot, my problems originated with a few trips to the dealer with CEL code for misfire on Cynlinder 4. This was 2-3 months before the breakdown.