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Old 12-01-2008, 07:06 PM   #1
pumpkyn
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Default is it ok to run unevenly worn tires for a week

just bought some wheels locally and 2 of them are at 90%, 1 at 80%, and 1 at about 20%. I would be running them for just 1 week. would i be ok with that?
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Old 12-01-2008, 07:11 PM   #2
AbrownSTIo6
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What are you running them on? I have not see anything wrong with this before, It is a short time period and you should be fine
AWD - Longer than a week may be harmful
RWD- not as bad wont do anything, i ran 100 and 10 percent for about three months, no big deal.
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Old 12-01-2008, 07:14 PM   #3
pumpkyn
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they are 225/40R18 Kuhmo Ecsta ASX. the turbo is on its way out so its not like ill be wanting to overwork the center diff much.
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Old 12-01-2008, 07:20 PM   #4
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Put the 20% and 80% on the front, since it has an open diff. I wouldn't put a lot of miles on that way but short trips should be OK (the spare is not full size after all)
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Old 12-01-2008, 07:59 PM   #5
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I'd keep your speeds low and follow Mike's suggestion.

I saw somebody overheat their rear diff by putting a spare tire on the rear end of their WRX and driving at freeway speeds for 40-50 miles.
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Old 12-01-2008, 08:43 PM   #6
pumpkyn
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thanks guys!

now how ok would it be to run 2 90% and 2 100%?
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Old 12-01-2008, 11:47 PM   #7
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The wear allowance: "Subaru Within 1/4-inch of tire circumference or about 2/32-inch of each other in remaining tread depth. "

http://www.tirerack.com/tires/tirete...currentpage=52

Your wheels need to spin at the same rpm running straight down the road to keep the diffs happy. Short term it's not a big deal. Long term could be expensive.
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Old 12-02-2008, 08:30 AM   #8
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^^^ to measure the circumference basically get the tire and roll it on some string?

or around that is if its the same tread, same kind of tire and say 2 are at 8-9/32 and the other 2 are at 10/32 then I should be fine?
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Old 12-02-2008, 11:02 AM   #9
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Im curious to know if having two new tires in the front and two old tires in the rear would be a problem long term. Somehow i managed to get 5 nails in one of my tires, and i cant afford to buy a whole new set of http://www.tirerack.com/tires/Sizes....Potenza+RE050A which are my current tires. I was thinking to leave those in the rear, and replace the front with http://www.tirerack.com/tires/Sizes....+Pole+Position . I live in NJ where the roads are terrible and we see snow a few times a year... my train of thought was that i could maybe get some grip in the snow, save some money, and not suffer too much handling. Theres about 10k miles on the old tires btw... if it were less i might consider just buying one of the same tires and being done with it.
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Old 12-02-2008, 12:46 PM   #10
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Quote:
Originally Posted by Ktempo View Post
Im curious to know if having two new tires in the front and two old tires in the rear would be a problem long term. Somehow i managed to get 5 nails in one of my tires, and i cant afford to buy a whole new set of http://www.tirerack.com/tires/Sizes....Potenza+RE050A which are my current tires. I was thinking to leave those in the rear, and replace the front with http://www.tirerack.com/tires/Sizes....+Pole+Position . I live in NJ where the roads are terrible and we see snow a few times a year... my train of thought was that i could maybe get some grip in the snow, save some money, and not suffer too much handling. Theres about 10k miles on the old tires btw... if it were less i might consider just buying one of the same tires and being done with it.
Bad idea on multiple fronts.

1) Do not run different model tires front/rear...it can screw up the center diff. The two tires you posted have a new tread depth difference of 1/32", and way different treadwear ratings.
2) The circumference rule by Subaru applies to all four tires...not pairs
3) Running a summer tire in the rear is a sure way to end up spinning out of control in the snow.
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Old 12-02-2008, 01:16 PM   #11
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Quote:
Originally Posted by pumpkyn View Post
^^^ to measure the circumference basically get the tire and roll it on some string?

or around that is if its the same tread, same kind of tire and say 2 are at 8-9/32 and the other 2 are at 10/32 then I should be fine?
You got it.


Personaly I use a 10' 1/4" steel tape measure for circumference.

Since the front tyres tend to wear more I'd start with the better set on the front. Rotating the tyres is important on these cars.
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Old 12-02-2008, 02:07 PM   #12
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Thanks for the info! I love my subaru, and im still learning =) Im more than a little paranoid about making decisions about my car, so the well informed response is appreciated.
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Old 12-02-2008, 11:37 PM   #13
pumpkyn
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thanks!! thats what happened with this set. I just got lazy and said screw it and didnt rotate them for about 10k then when i took the front tires off the tires were worn fairly more than on the front. so thats why im getting new wheels and tires
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