Carlisle tire, st215/75r14 mounted as a factory installed spare on a tennessee brand boat trailer. Tire has never been used, always as a spare. On 8/14/10, observed a "blister" had developed at the tire shoulder (where tread meets sidewall). On 8/21/10, a belt separated from the tire resulting in the tread and belt peeling from the tire (tread separation). There is a 6" wedge of belt sticking straight out of the tire where the tread split, and approx. 12" Of tread has detached from the tire. I have never witnessed...
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a tread separation failure like this on a tire that was a dedicated spare and has never been used. For reference: trailer is in a garage nov-mar. It is outdoors and exposed to elements apr-oct. Tire pressure checked monthly, and always before trips. *Tr