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I'd be of the school of thought is that 15 years is definitely pushing it..
That said, if I had them, and I needed snow tires, I'd use them.. Especially if you've had them stored indoors. But I would absolutely avoid any high speed driving. Around town type stuff, I think you'd be fine. And if you have a blow out at low speed, not generally a biggie..
It's at high speeds that tread separation is more likely to happen, and that's where I'd be afraid of old tires.. since compromises in that regard are invisible.
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-Matt I ♥ my ♂
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