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What is the tire size of the Audi A8?

2 Answers
StSophie
07/29/25 3:12pm
The Audi A8 has two tire sizes: 255/45R19 and 265/40R20. The first numbers, 255 and 265, represent the tire width in millimeters (255mm and 265mm, respectively). The numbers 45 and 40 indicate the aspect ratio of the tire's cross-section, which is 45% and 40%, meaning the height of the cross-section is 45% and 40% of the width. The numbers 19 and 20 represent the rim diameter in inches. The letters or symbols in the middle have special meanings: "X" denotes high-pressure tires; "R" and "Z" denote radial tires; "-" denotes low-pressure tires. The original tire brands for the Audi A8 mainly include Dunlop, Michelin, and Bridgestone. If you want to replace the tires yourself, you can follow these steps: Take out the spare tire and jack, place the jack under the vehicle frame of the tire to be replaced, ensuring the jack touches the metal part of the frame. Raise the jack until it supports the car. The jack should be positioned under the vehicle, and ensure it is at a right angle to the ground. Remove the hubcap and loosen the nuts counterclockwise. Do not fully loosen the nuts; just loosen them enough to eliminate resistance. When loosening the nuts for the first time, keeping the tire on the ground ensures that the nuts, not the tire, are turning. Turn the nuts counterclockwise until they are loose. Repeat this step for all lug nuts and then remove them completely. Place the new tire on the wheel hub, carefully aligning the tire rim with the wheel bolts. Install the lug nuts and tighten them by hand until all nuts are concealed. At this point, the tire replacement is complete. In addition to the size, tires also have the following common markings: Tire cord material: Indicated by Chinese pinyin, such as M for cotton cord, R for rayon cord, N for nylon cord, G for steel cord, and ZG for steel radial cord tires. Speed rating: Indicates the maximum speed at which the tire can carry a specified load under specified conditions. Letters A to Z represent certified speed ratings from 4.8 km/h to 300 km/h. Common speed ratings include: Q: 160 km/h; H: 210 km/h; V: 240 km/h; W: 270 km/h; Y: 300 km/h. Rim specification: Indicates the rim specification compatible with the tire for practical use, such as standard rim 5.00F.
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StMalia
08/13/25 7:54am
The tire model for the Audi A8 really depends on the specific configuration. From my experience, the base model usually comes with 255/45 R19, which ensures comfort for daily driving. Higher trims or sport versions may upgrade to 265/40 R20 or larger sizes for better handling. Seasonal considerations are also important when choosing tires—I use all-season tires in the north to cope with unpredictable weather. Regular tire pressure checks are a must; I measure it every three months to maintain 2.4 bar, as incorrect pressure can lead to instability and higher fuel consumption on highways. New owners should stick to the manufacturer-recommended brands like Michelin or Bridgestone for durability and ease of maintenance. Avoid switching to non-standard sizes to prevent affecting the suspension system and overall driving quality.
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