Some customer always asked us this question. As a professional manufacture we have to explain to all of friends who wants to know the answer.TheThe thin thread coming out of the tire vent hole can be seen in a certain degree of quality, but it is not absolute. can be seen in a certain degree of quality, but it is not absolute. For example, if the vulcanization time is too long, the line coming out of the vent hole will not be resistant to drag, and the thickness of the vent hole is also Directly lead to whether the cable is drag-resistant.
So only to drag the thread from the tire vent can’t determine the quality.