Tread depth on new RFTs

Could someone please tell me the tread depth on new Bridgestone run flats so I can estimate life of the tyres on a used Z4.
Thanks.
 
8-9 mm is what I measured on a new pair of front RE050A RFT's.

At 3mm they get noticably less grippy, need some new rears shortly methinks as they are 3/4mm :) :driving:
 
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