If I had to offer a professional opinion I'd be wondering how old the tyre was and whether it'd been sat under-inflated or potentially driven on under-inflated at any time in its life.
A combination of the 2 is the usual cause of structural failure unless there's an underlying fault in the carcus construction from new
Always scary as rear failures usually result in oversteer unlike fronts which tend to understeer. One of the reasons that perceived wisdom is to have your best tyres on the rear axle
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
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