fritz:
RC:
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. What is weird is that the other tires don't have it.
Then it might be be a rather poorly executed repair in the surface of just one particular mould, due to a mark or local damage to its surface.
It won't have any influence on the integrity of the tyre.
I think the worker must have dropped a coin in the mould
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"Form follows function"