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Old 01-25-2009, 04:52 PM   #1
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Join Date: Oct 2008
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2008 WRX FMIC/VF48
Red/Steel Grey

Default Question about flat tires and Subies AWD setup

I'll admit that this may be a dumb question but I got to thinking about this a couple of days ago and I'm seeking out to hear the 'experts' on this forum. . .

I swapped out my stock tires (08 WRX) with a set of 18" Rota's and I found out that while swapping my tires that Subaru forgot to put a jack a spare tire in my trunk. . . I was pissed.

But I was thinking about where to go to buy a spare tire incase of getting a flat and a question occured to me: with Subies AWD setup do I need to have my spare tire be the same exact radius of my regular tires to avoid damaging the tranny/center differential when driving on the spare tire?

And there is the VDC traction control on the cars as well. . . if I have a spare tire that is for sake of argument 1" smaller in diameter than the 3 other tires on the car, when driving is the VDC system going to detect the smaller spare tire rotating faster than the other 3 tires and then the car's computer will start messing around with the braking system because it thinks I'm on ice or something slippery?

I really don't have a good understanding of the AWD on these cars and would like to know whether or not I need to get a spare tire that's the same diameter as my regular wheels.
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Old 01-25-2009, 05:10 PM   #2
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2003 WRX


What's the owners manual say? I don't carry a spare any more. Just tire plugs and a couple cans of "fix-a-flat".
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Old 01-25-2009, 06:17 PM   #3
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+1 for reading your owners manual. We love questions, but not ones covered by stuff you already have access to.
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