What Do the Parameters on Car Tires Represent?
2 Answers
Car tire parameters represent the following: The parameters displayed on the tire model indicate the tire's width, aspect ratio, type, and applicable size. Taking the model 225/60R17 as an example, 225 indicates the tire section width is 225mm; 60 is the aspect ratio, meaning the tire sidewall height is 60% of the tire section width; R stands for radial tire; and 17 indicates the tire is suitable for 17-inch rims. Car tires are one of the essential components of a vehicle, directly contacting the road surface and working with the car's suspension to mitigate impacts during driving, ensuring good ride comfort and smooth driving.
Last time I changed tires was when I finally understood the meaning of these parameters. Take the typical marking 205/55 R16 91V as an example: 205 is the tire width in millimeters - the larger the number, the wider the tire with better grip but also higher fuel consumption; 55 is the aspect ratio, meaning the sidewall height as a percentage of the width - smaller numbers make the tire look thinner with better sporty performance; R indicates radial construction which is basically standard now; 16 is the rim diameter in inches; 91 is the load index - I checked the chart and 91 corresponds to 615 kg per tire; V is the speed rating indicating a maximum speed of 240 km/h. When choosing tires, I mainly focus on whether the first three parameters match the original vehicle requirements, while the last two must also be properly matched to avoid overloading or exceeding speed limits.
