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Drew,
The only time I have seen this type of failure was on a 66 T-bird with a Firestone red-wall full size bias ply spare in the trunk. It still held air but the treads / belts shattered the same way. Note, this was on a parts car that had sat at the back of the bone yard for 20 years with the trunk shut.
The theory is that such failure occurs due to the heat (in the trunk) cooking the oil out of the rubber causing it to become brittle. Now we know why tires have a born-on date eh?
I'll check our spare in a few minutes, as I wish to avoid the same failure. It also speaks volumes to the 50MPH limit they expect us to hold on a spare tire!
jorrell
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92 245 278K miles, IPD'd to the hilt, 06 XC70, 00 Eclipse custom Turbo setup...currently taking names and kicking reputations!
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