What does the car tire specification 205/55R16-91V mean?

[DelCaroline]

Tire parameter 205 refers to the tire's section width of 205 millimeters. 55 represents the aspect ratio, which is the percentage of the tire's section height divided by its width. R stands for radial tire, and 16 indicates the rim diameter of 16 inches. 91 is the load index, with 91 corresponding to a load capacity of 615 KG, and V is the speed symbol. Below is relevant information: 1. Tire specifications: Tire specifications are the marked data indicating tire parameters and performance. Generally, tire specifications are a set of numbers, with the first number representing the tire section width and the last number representing the rim diameter, both in inches. The letters or symbols in between have special meanings: "x" indicates a high-pressure tire; "R" and "Z" indicate radial tires; "-" indicates a low-pressure tire. 2. Tire rolling direction: The tread pattern on a tire is crucial for drainage and anti-skid performance during driving. Therefore, off-road tires with asymmetric tread patterns often use arrow markings to indicate the assembly rolling direction to ensure the designed grip, anti-skid, and other performance characteristics. If installed incorrectly, it can have the opposite effect. 3. Tire production batch number: A set of numbers and letters is used to indicate the manufacturing date and quantity of the tire. For example, "98N08B5820" means the 5820th tire produced in group B in August 1998. The production batch number is used to identify the age and storage time of the tire.

[McEsther]

That tire specification 205/55 R16 91V, I'm quite familiar with it. The key to tires lies in matching the vehicle's performance. 205 refers to the tire width in millimeters—the wider it is, the better the grip, making it more stable at high speeds like on highways. 55 is the aspect ratio, meaning the tire height is 55% of the width. A smaller number makes the tire look squat, improving handling but making the ride slightly bumpier; a larger number like 55 offers a balanced stiffness that absorbs shocks well. R stands for radial construction, with a special internal steel belt arrangement that improves fuel efficiency and durability. 16 is the rim diameter in inches—when buying a car, you need to check what size tire the rim fits. 91 is the load index, indicating a maximum load capacity of 615 kg per tire, so don't overload it for daily use. V is the speed rating, allowing a top speed of 240 km/h, which is more than enough for city driving, but don't speed recklessly. Regularly checking tire pressure and wear can extend its lifespan.

[KennedyLee]

As a car owner who enjoys tinkering with vehicles over the years, the specs 205/55 R16 91V may not be profound knowledge but highly practical. The 205mm width is common for sedans, providing solid cornering stability. The 55 aspect ratio strikes a balance—neither too tall nor too low-profile, offering decent bump absorption on rough roads. The "R" denotes radial construction, far more durable than outdated bias-ply tires. 16-inch wheels are a versatile fit for many models, simplifying tire replacement. The 91 load index means each tire can handle 615kg—perfectly adequate for a fully loaded family car. The V speed rating exceeds urban driving needs. When I last changed tires, I cross-checked these parameters to ensure proper matching, which reduced noise and improved ride comfort. Pro tip: prioritize reputable brands; budget tires wear out alarmingly fast.

[StTeagan]

Hey, I asked the same question when I first started learning to drive. 205/55 R16 91V is essentially the tire's ID card: 205 is the width in millimeters—the wider, the more stable; 55 is the aspect ratio, meaning the sidewall height is 55% of the width, offering a balanced and comfortable ride; R stands for radial construction, which reinforces the internal structure; 16 is the rim diameter in inches—make sure it matches your car's wheel hub when buying; 91 is the load index, corresponding to a maximum load of 615 kg; V indicates the speed rating, with a top speed of 240 km/h, which is more than safe for daily driving. Always match the specs recommended in your vehicle's manual—don’t randomly change tire sizes to avoid potential risks. Simply put, every number and letter serves a purpose. New drivers should consult their mechanic friends more often.