What does 235/55r18 mean?

1 Answers
RichardAnn
07/29/25 11:24pm
235 indicates the tire's cross-sectional width of 235mm; 55 represents the aspect ratio of the tire, with a higher value indicating a thicker tire; r stands for the tire type, which is radial, and 18 denotes the rim diameter of 18 inches. Below is relevant information about tires: 1. Wear: Tires have wear indicators. There are triangle marks on the sidewall of the tire, and it is recommended to replace the tire when the wear reaches the point indicated by the triangle. Inside the tire's tread grooves, there are also raised markers. When the wear reaches the level of these raised markers, the tire should be replaced. Simple punctures can be repaired without needing replacement. However, bulges must be replaced. 2. Aging: Rubber oxidizes in the air, and oxidized rubber hardens, reducing grip. Therefore, even if a set of tires is not used, its lifespan will decrease. It is not recommended to use tires for more than 5 years from the production date. The production date is marked on the sidewall of the tire.
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