Last post on Feb 23, 2012 at 4:42 PM
You are in the Subaru Legacy & Outback
What is this discussion about?
Subaru Legacy, Subaru Outback, Tires, Wheels, Wagon
#75 of 124 Re: New Tire Question #2 [jackaspades]
Sep 04, 2008 (3:08 pm)
Well, my thinking is that if it is close to the specified size and all four are the same, there should not be added stress on the AWD system. I am really not sure if it would affect VDC, but I would think VDC tracks wheel-to-wheel spin differentials, which would not be affected by a different tire size.
#76 of 124 Re: New Tire Question #2 [xwesx]
Sep 04, 2008 (7:33 pm)
So long as the diameter is the same on all 4 you will be ok.
I have always liked the Pirelli Scorpion tires. I just put the STRs on my Dad's Trooper.
#77 of 124 Excessive tire wear on a 2005 Legacy Outback
Sep 05, 2008 (12:56 pm)
We have a 2005 LOB, purchased new. At 20K miles (almost all highway) on the original tires (Potenzas) the outside edges of the rear tires were almost worn through. The front tires were not bad.
I took the car to the dealer and said that the tires were wearing prematurely and there must be something wrong with the alignment or some other problem with the car. He said that it was my fault for improper inflation, in that the wear patterns indicated under-inflation. I told him I know how to keep my tires properly inflated but got nowhere. I foolishly agreed to let him replace all tires with new Potenzas. They also did a balance and alignment.
20k miles later with regular rotation and proper inflation, I am seeing the exact same wear pattern as before. (see photos below). I am steeling myself to go back and argue with the dealer, even though I know it's not going to do me any good. Regardless, I would like to have this problem fixed. Does anyone have ideas about what might be causing this excessive and uneven wear?
thanks for your help
#78 of 124 Re: Excessive tire wear on a 2005 Legacy Outback [vdonovan]
Sep 05, 2008 (2:11 pm)
That's not too bad, to be honest.
You do need 4 new tires, though. The rears are totally spent and the front won't last another winter. Shop now.
#79 of 124 Re: Excessive tire wear on a 2005 Legacy Outback [vdonovan]
Sep 05, 2008 (2:24 pm)
Subaru issued a Technical Service Bulletin #05-36-07R in regards to their changing rear wheel alignment and increasing tire pressure because of uneven wear on rear tires when carrying a heavy load. When I load up my 07 OB I try to increase the pressure on the rear tires to the number indicated for pulling a trailer which also puts a load on your rear tires.
I can't help you with the details of the TSB as you need to subscribe (pay) to download them from subaru.com, but your dealer and/or /Subaru Customer Service might be able to enlighten you.
Juice is correct in your needing four new tires, but also see if your rear alignment needs correction as per the TSB.
I suspect that the original alignment values and tire pressures resulted in the outside edges wearing too quickly. Have you been carrying heavy loads?
#80 of 124 Re: Excessive tire wear on a 2005 Legacy Outback [snowbelter]
Sep 05, 2008 (3:40 pm)
Aw, darn. I had a link to a site that listed all the Subaru TSBs, but it is no longer valid. Bummer, that. I worked long and hard to find the thing. It is ironic, to me, that Subaru would charge for TSB access when we already spent enough flippin' money on the cars in the first place!
#81 of 124 Re: Excessive tire wear on a 2005 Legacy Outback [snowbelter]
Sep 05, 2008 (3:46 pm)
Perhaps this is counter-intuitive, but I would think that carrying a heavy load (which typically vests with the rear suspension) would tend to cause the inner edge of the tires to wear faster than the outer edges, as the suspension drop would put more pressure on the inside edge of the tire. Maybe not, though.
I noticed no oddities on my 2008 Outback's tires, and I had a heavy load (probably more than the rated capacity, to be honest) in it for the first 5500 miles of its life. Maybe they had the issue corrected by then.
Have you not had the 4-wheel alignment reset? If the tires are wearing unevenly, that would be a good place to start.
The Potenza are probably not overly reliable as a test tire, as they wear very quickly anyway. General reports seem to give them a lifespan of 20-30,000 miles.
#82 of 124 Re: Excessive tire wear on a 2005 Legacy Outback [xwesx]
Sep 05, 2008 (4:44 pm)
I read somewhere that the TSB changes the toe-in specs.
#83 of 124 1990 subaru legacy wont run in the mornings!!!!!!
Sep 07, 2008 (12:21 am)
hey guys I got this lil big problem with my 1990 sub legacy L, 5 speed every time i try to turn it on in the mornings it wont pwr up the fuel pump and the car wont run, but when i get home from work or let it sit in the garage over night it pwrs right up and oway it goes, Ive tryied the fuel pump relay and ign relay and its still doing the same thing so can some one out there point me in the right direction PLEASE i would be more then greatfull.... Thanks ; )
#84 of 124 Re: Excessive tire wear on a 2005 Legacy Outback [vdonovan]
Sep 08, 2008 (7:57 am)
The common knowledge about tire inflation says that shoulder wear is an underinflation problem, but I was seeing the same thing with my OEM tires and a tire guy told me that Bridgestones react just the opposite, so they cup and wear the outer edges when overinflated. I have been trusting that when I get my car serviced they know what my tires should be inflated to and I have been wrong to do so. There is also the difference between what the tire sidewall says they should be inflated to and the placard on the inside of the driver door panel. Not sure if that helps any.