Steel rings, also known as hubs, are an important part of semi-trailers . The “hub” and “tire” are two completely different parts. The so-called "tire" is the rubber part of the trailer, which is itself soft, so the inner profile of the tire supports the drum, and the center is the wheel mounted on the shaft. Maintenance method of steel ring: 1. When the temperature of the steel ring is high, it should be allowed to cool after it is naturally cooled. Never use cold water to clean it. Otherwise, the aluminum alloy steel ring will be damaged, and even the brake disk will be deformed to affect the braking effect. In addition, cleaning the steel ring with a cleaning agent at a high temperature causes a chemical reaction on the surface of the steel ring, which loses luster and affects the appearance. 2. When the steel ring is covered with hard-to-clear tar, if the general cleaning agent does not help, try to remove it with a brush, but do not use a hard brush, especially an ...