Edited by goof_ball, 23 September 2013 - 11:46 PM.
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mismatched tires concern
Posted 23 September 2013 - 11:35 PM
Posted 24 September 2013 - 12:12 AM
the specific brand of tire or even the tire model shouldnt matter so long as there all the same size
Posted 24 September 2013 - 12:14 AM
it doesn't matter. keep rolling.
they're all the same size. sure - check tread diameter if you want - i wouldn't waste my time as i've been around Subaru's long enough to know it won't matter.
You can put completely different brand/tread on there and it won't matter. if slight variations in tires (other than size/circumference) could blow up your transmission then that assumes some kind of resistance/weight/inertia difference causes issues - you'd have to worry about different amounts of grease in the DOJ's, the CV band clamps being different weights, axles being different weights, rocks stuck in the tread, mud or snow caked in the rim making them weigh different amounts....subaru transmissions would be blowing up all the time based on the way some people talk about tires on Subarus.
there are tire shops around here that install two new tires on subarus - one on the front and one on the opposite side rear. i'm not saying i recommend that or think it's a good idea and i've never done it...but apparently it is suggested that due to the way open differentials work (only one tire in the rear and one tire in the front is actually driven by the trans), it's possible to do that.
get a FWD car stuck - only one tire spins - that's why FWD tires don't need to match even up front.
get a 4WD Subaru (without rear LSD or VDC or DCCD - none of which yours has stock) stuck and how many tires spin - 2.
Edited by grossgary, 24 September 2013 - 12:16 AM.
Posted 24 September 2013 - 12:16 AM
Good news is 200 miles of wear isnt anywhere near enough to cause damage to the drivetrain, or cause enough tread wear of the new tires to affect overall circumference (probably still has the "nubs" on the tread). And that oddball tire is probably within the 1/4" max. difference in circumference allowed by Subaru.
Not to say you should keep that tire, traction temp and tread wear ratings of that tire may be different than the other 3, and even if they aren't significantly different the tread design and rubber compound could cause that tire to have different traction characteristics which could cause some issues when you need to make a panic stop, or just drive across town in the rain.
Point it out, and make sure the shop puts the correct tire on the car.
Posted 24 September 2013 - 10:16 AM
It will be fine. IF you had 2 pairs of different tires, then there could be a rotational difference across the center diff. Theoretically you can run one size on one side of the car, and another size on the other side, or diagonal. The odd duck tire is best suited to the rear.
Posted 24 September 2013 - 10:37 AM
On my first Subie, a 91 Leggie with AWD, I didn't know anything about matching tire size, or tread depth difference. I drove the car with different brand tires and tread differences for over 100K miles, and never had a problem. So, my advise is to not worry about it.
Posted 24 September 2013 - 06:39 PM
Point it out, and make sure the shop puts the correct tire on the car
short term there will be no problems.
but i would not drive with it long trerm.
subaru is very specific about the circumference of the tires on an AWD car.
make them correct the issue.
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