Precautions: 1. During the process of removing and installing tires, please use professional tools to avoid damaging the tires. 2. After installing new tires, please ensure that the inflation pressure is around 90PSI for the first time. When you hear two loud bangs, stop inflating. At this point, the tires are in a fully inflated state. Then slowly deflate the tire to a pressure of around 45PSI.