What does tire size 235/65r18 mean?
2 Answers
Tire size 235/65R18 is a tire specification code. In 235/65R18, 235 represents the tire width of 235mm, 65 represents the aspect ratio (height to width) of 65%, R indicates that the tire is a radial tire, and 18 means the tire is suitable for 18-inch rims. Additional information: 1. Small car displacement: Ranging from 0.8-1.5, with corresponding tire sizes between 155/65R13 73T to 175/70R14 77H. 2. Compact car displacement: Ranging from 1.4-2.0, with corresponding tire sizes between 185/60R15 to 205/40R16. Midsize car displacement ranges from 1.5-2.5.
The tire code 235/65R18 is actually quite easy to understand. 235 refers to the width of the tire, measured in millimeters, which is the width of the tire's cross-section. 65 is the aspect ratio, meaning the height of the tire is 65% of its width—it's a proportional number. The smaller the number, the thinner the tire, making it stiffer during off-road driving. R stands for radial construction, the standard design for modern tires, which makes them more durable. 18 is the diameter of the wheel rim, measured in inches, representing the size of the metal center part of the wheel. This specification is common on SUVs or mid-sized cars. I've driven with this type of tire for several years and find it well-balanced—not too bumpy yet provides good traction. When choosing tires, also pay attention to the tread design. If they're severely worn or have a blowout, replace them immediately to avoid accidents on long trips. In cold weather, check the tire pressure regularly because the size affects stability. Overall, remembering these numbers helps you match the factory settings and drive with more peace of mind.
