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Old 07-03-2008, 02:36 AM   #1
jmeltzer4
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Default Running non-matching spare wheel/tire?

Would I potentially endanger my differentials if I used a non-matching wheel/tire combo as a spare?

For example: I have Tarmac 2's w/Falken RT-615s 235/40/17 on my car and was thinking about picking up a STi rim with a random 235/40/17 tire on it as a full-size spare. Let's say I have a flat and put the STi rim on......Am I going to ruin the mechanical bits by running one non-matching tire & wheel?

Thanks!
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Old 07-03-2008, 02:52 AM   #2
Patrick Olsen
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As long as you treat it like a spare, no.

Pat Olsen
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Old 07-03-2008, 02:56 AM   #3
ciper
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Quote:
Originally Posted by jmeltzer4 View Post
w/Falken RT-615s 235/40/17 on my car and was thinking about picking up a STi rim with a random 235/40/17 tire
If the wear level on the tires is similar then the outward diameter should be within the limits so even non spare shouldn't be an issue.

Why do you want a full size spare?
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Old 07-03-2008, 02:57 AM   #4
jmeltzer4
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Why do you want a full size spare?
I've always been under the impression that you have to have equal sized tires on all four corners with an AWD car. Is this not right?
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Old 07-03-2008, 08:33 AM   #5
SimonJ
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Assuming you treat it as a spare
ie - only drive on it long enough to get to the nearest garage or gas station, then yes, you'll be fine.
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Old 07-03-2008, 12:17 PM   #6
jmeltzer4
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Awesome, thanks everyone
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Old 07-03-2008, 01:35 PM   #7
ciper
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Originally Posted by jmeltzer4 View Post
I've always been under the impression that you have to have equal sized tires on all four corners with an AWD car. Is this not right?
Not exactly right. You have to have equal DIAMETER tires on all four sides, not necessarily equal size. Thats why some AWD vehicles have an odd looking (expensive to replace) donut.
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