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What do 6PR 52P and 6PR L in motorcycle tires mean? What are the international standards?

PR stands for tire strength. The bigger the number before PR, the stronger the tire strength. In 52P, 52 is the load index. The larger the number before p, the greater the load. The load of 52P is about 200 kg. In 52P or 52L, P and L are speed symbols, the maximum design speed of L is 120km/h, the maximum design speed of P is 150km/h, and the later the letters are, the faster the allowed maximum speed is.