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Originally Posted by kt1
That actually depends on tire manufacturers. Some tires vary from 8mm-9.50-10 mm (9/32 - 10/32nd of an inch) of tire depth. Major OE supplier to Porsches would be Michelin and Bridgestones and they range from the Michelin Pilots to the Bridgestone RE960 or RE040, each brand and model having varying tire tread depths when new.
Anyway, when tire depth goes lower (sometimes bridgestons have the Uni-t and dual layer technologies to curb breakdown of the effectiveness of the rubber) the rubber compound is exposed to heat and other elements which causes a reduction of tire 'stickiness' or effectivness of grip which results in the factory and repair shop standard of replacing tires when reaching 3/32nds of an inch.
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8MM on Continental and Michelin OEM tires on the Box. At least that is what they were a few years ago.