Even if never used, rubber decays over time; most experts recommend replacing a spare every 6–10 years .
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When buying a replacement, never assume they are universal. You must verify:
Compact spares require much higher pressure than standard tires, usually 60 PSI . Safety and Usage Limits
Goodyear Convenience Spare Tire T155/90d16 5 Lug 16" Fits Chrysler