What does 235/55-R18 on a tire mean?

[ElliottMarie]

235 indicates the tire's cross-sectional width of 235mm; 55 represents the aspect ratio, which is the percentage of the tire's cross-sectional height divided by its width; R stands for the tire type, radial tire, and 18 denotes the rim diameter of 18 inches. Below are some tire maintenance tips: 1. Enhance awareness of tire safety by regularly inspecting tires, especially before highway driving. Conduct thorough checks including tire pressure and examine the sidewalls for cracks and tread wear patterns. Address any potential hazards promptly. 2. Regularly correct wheel balance. Excessive wheel imbalance can cause high-frequency vibrations at high speeds, leading to uneven tire wear and compromising driving safety. After tire repairs, perform dynamic balance testing and adjustment. The single-side dynamic balance measurement should not exceed 40 grams. 3. Implement regular tire rotation. To ensure even wear across all tires on a vehicle, rotate tires every 5,000 kilometers and perform a four-wheel alignment every 5,000 to 10,000 kilometers to prevent abnormal excessive wear. Do not install tires of different models or with significant wear differences on the same axle.