fritz:

It's harmless. It's just a replaceable insert in the mould. For instance, to allow changes to be added later, like additional lettering or numbers. It's just like the oval date stamp insert next to it, which has to be changed every time a new batch of tyres is made to correct the production week number. 

Thank you. Smiley What is weird is that the other tires don't have it. Smiley


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RC (Germany) - Rennteam Editor Porsche 991 Turbo S, Cayenne GTS (958), BMW X3 35d (2013)