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Old 03-16-2008, 10:42 PM   #1
WhiteFox
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Default How bad is it really, to have 2 different sets of tires on an AWD car?

I have a pair of like new tires that would fit my summer wheels, but I need another pair for the other 2 wheels. Is it really a big deal to not buy a set of 4 tires? Do the diameter of the tires have to be EXACTLY the same, or can the center diff deal with it?
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Old 03-17-2008, 12:17 AM   #2
Arctic Penguin
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the rollout MUST be within 1/4" for all tires when mounted

the center diff isnt happy otherwise
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Old 03-17-2008, 02:00 AM   #3
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how much of a factor does 'grip' play?
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Old 03-17-2008, 08:52 AM   #4
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Different pairs but size within limit?
I suspect that you would need to remeasure the tires from time to time to verify that they are still within limit. What if smaller diameter wears faster?

Krzys
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Old 03-17-2008, 11:48 AM   #5
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I've run with 2 different sets of tires without any problems for a while, but it's time for new tires, but I already have a pair of slightly used tires, I just need a matching pair. I'll have to measure the tires to make sure the circumferences are the same, or at least close.
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Old 03-17-2008, 11:58 AM   #6
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are u talking about like running a 215/45 up front and a 225/45 in the rear?
b/c im not sure if thats allowed or not and im curious for an answer on that myself.
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Old 03-17-2008, 02:38 PM   #7
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For the short term, you should be ok, but I wouldn't use that setup as a long term solution.

I ran mismatched snow tires (same size, but one was about .5" wider diameter than the other set) for one winter, it did fine, but I went to a matched set the next winter...
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Old 03-17-2008, 05:20 PM   #8
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Quote:
Originally Posted by shatteringstar View Post
are u talking about like running a 215/45 up front and a 225/45 in the rear?
b/c im not sure if thats allowed or not and im curious for an answer on that myself.
THAT would kill the center diff
fo sho
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Old 03-17-2008, 06:32 PM   #9
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No all the same size tires, like 245/45/18 but different brands/mileage on the front vs rear.
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Old 03-18-2008, 05:06 PM   #10
Sportbiker40
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The Brand doesnt matter.. Its like they said in the above.. All tires have to be within 1/4 inch..

Example.. One Summer I used 215/45's in the front and 245/40's in the rear.. It looked really cool. It wouldnt pass inspection like that though..

Even though the tires were diff sizes the overall Circum. was about 1/8 of an inch diff between the front and the rear.

This year Im gonna run 245/40's all round
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Old 03-19-2008, 11:35 AM   #11
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If the circumferences are close enough, then the diffs will be OK. However you may run into problems when you push the tires to the llimit or use them in reduced traction. Mismatched tires front/rear can be perfectly fine when it's dry, but give you extreme over/understeer in rain.
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Old 03-19-2008, 02:09 PM   #12
DapRex
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A month after I bought my 04 I ran over a self tapping sheet metal screw. I took it to a tire place, told them i wanted a patch since it was practically brand new.

Well he took the tire off and said oh my, I cant put a patch thar! and tried to sell me 4 tires. I just bought one but it wasnt the same brand, and I ran that set up for oh 60k or something.

Not that it helps, just thought id share
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Old 03-19-2008, 03:22 PM   #13
internet ankle-biter
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what the manual says is:

"All four tires must be the same in
terms of manufacturer, brand
(tread pattern), construction, degree
of wear, speed symbol, load
index and size. Mixing tires of different
types, sizes or degrees of
wear can result in damage to vehicle’s
power train. Use of different
types or sizes of tires can also
dangerously reduce controllability
and braking performance and
can lead to an accident."
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