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Old 07-12-2005, 02:39 PM   #1
o2sys
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Default Having different tread wear

If you have two tires with less thread then the other two is there any problem???
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Old 07-12-2005, 02:42 PM   #2
o2sys
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to bee more specific, im getting the same tires all 4 of the same kind with 2 of them with 60% thread left and the other two with 90% thread left.....
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Old 07-12-2005, 02:50 PM   #3
Kean
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Check your manual (it's in there). As long as the difference is within the tolerance specified in the book, you should be fine.
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Old 07-12-2005, 06:08 PM   #4
o2sys
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bump....lost my manual (or cant seem to locate)
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Old 07-12-2005, 06:12 PM   #5
KSwrxWAGON
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Keep the tires with the same amount of wear on the same end of the car (front/back). If you have different overall diameters on the same axle, you will overwork your differential, causing it to overheat and break. If you have a center diff., which only STi's do, you have to watch all four tire diameters to avoid excessive wear on the diffs.
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Old 07-12-2005, 06:35 PM   #6
o2sys
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Quote:
Originally Posted by KSwrxWAGON
Keep the tires with the same amount of wear on the same end of the car (front/back). If you have different overall diameters on the same axle, you will overwork your differential, causing it to overheat and break. If you have a center diff., which only STi's do, you have to watch all four tire diameters to avoid excessive wear on the diffs.
So you are saying i can have two of the same worn tires for the front or back and the other two of the same worn tires for the back or front..just dont mixem up right? like 60% on driver side front and 90% pass front....

and i thought the WRX did have the center diff, just cant control it like the STi.....
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Old 07-13-2005, 02:06 AM   #7
GravelRash
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Subaru specs no more than 1/4" difference in tire circumference (mounted and correctly inflated) among all 4 for the WRX. (Ref Subaru.com, My Subaru...set up an account if you don't have one; check out Care Care Tips, then Tire Wear...)

And yes, the WRX does have a center diff, a viscous LS unit - same type as the rear diff, which contributes to the tire size issue.

Given a nominal 25" dia. tire (which is definitely close enough for calculation), a 1/4" difference in circumference will equate to 0.04" difference in tread depth measurement. So, a bit more than 1/32" (0.03125"), but way less than 1/16" (0.0625").

So check 'em out and see if you're within the limits. But if those 60% and 90% figures are correct you won't be (If 10/32" tread depth when new - and it was likely very close to that - then the difference now will be 3/32" - way over the limit.) Presumably you could have the 90% pair shaved enough to bring you w/in the limit, but that may not be worth it.

If you run them anyway? Put the larger pair on the front - higher wear rate, more critical traction. Will you blow a diff on your next trip to the store? No, but you do risk shortening the life of the center diff...and no one can tell you by how much except possibly Subaru.
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Old 07-13-2005, 11:01 AM   #8
o2sys
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Quote:
Originally Posted by GravelRash
Subaru specs no more than 1/4" difference in tire circumference (mounted and correctly inflated) among all 4 for the WRX. (Ref Subaru.com, My Subaru...set up an account if you don't have one; check out Care Care Tips, then Tire Wear...)

And yes, the WRX does have a center diff, a viscous LS unit - same type as the rear diff, which contributes to the tire size issue.

Given a nominal 25" dia. tire (which is definitely close enough for calculation), a 1/4" difference in circumference will equate to 0.04" difference in tread depth measurement. So, a bit more than 1/32" (0.03125"), but way less than 1/16" (0.0625").

So check 'em out and see if you're within the limits. But if those 60% and 90% figures are correct you won't be (If 10/32" tread depth when new - and it was likely very close to that - then the difference now will be 3/32" - way over the limit.) Presumably you could have the 90% pair shaved enough to bring you w/in the limit, but that may not be worth it.

If you run them anyway? Put the larger pair on the front - higher wear rate, more critical traction. Will you blow a diff on your next trip to the store? No, but you do risk shortening the life of the center diff...and no one can tell you by how much except possibly Subaru.

thanks....so in the end is not worth the risk i guess, i found the manual last night and was reading about it....but this helped more....
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Old 07-14-2005, 05:55 PM   #9
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Cool; sorry to bust up your party
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