Why does a high-carbon fishing rod put on the car grind a gap in the inner joint?

Because the inner section of high-carbon fishing rod is bare carbon. The inner section of high-carbon fishing rod in the market is bare carbon, and the front mouth will be striped (the grain on the surface of bare carbon) in the process of pulling out, which is easy to cause carbon loss, which is also the reason why the inner section of high-carbon fishing rod will be worn out when it is mounted on the car. There is a small gap at the rod joint, so as long as the rod joint is not connected, it will generally not affect the use.