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What is the tire size for the BMW 5 Series?

1 Answers

MacMiles

07/30/25 9:18am

The BMW 5 Series has two tire sizes: 245/45R18 and 245/40R19. In 245/45R18, the first number 245 represents the tire width of 245MM, 45 indicates the aspect ratio of the tire section is 45%, meaning the section height is 45% of the width, 18 stands for the rim diameter of 18 inches, and the letter "R" in the middle denotes a radial tire. In 245/40R19, the first number 245 represents the tire width of 245MM, 40 indicates the aspect ratio of the tire section is 40%, meaning the section height is 40% of the width, 19 stands for the rim diameter of 19 inches, and the letter "R" in the middle denotes a radial tire. The BMW 5 Series tires feature a dual-tone, five-spoke wheel design, and the tire brands include Pirelli, Bridgestone, Michelin, etc. 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 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 under the vehicle, check and ensure the jack is perpendicular to the ground; Remove the hubcap, loosen the nuts counterclockwise, do not fully loosen them, just enough to eliminate resistance. When loosening the nuts for the first time, keeping the tire on the ground ensures that the nuts turn rather than the tire; Turn the nuts counterclockwise until they are loose, repeat this step for all lug nuts, then completely remove the nuts; Place the new tire on the hub, carefully align 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 model, the tire also has the following common data marked on it: Tire cord material: represented by Chinese pinyin, such as M-cotton cord, R-rayon cord, N-nylon cord, G-steel cord, ZG-steel radial cord tire. Speed rating: indicates the maximum speed at which the tire can carry the specified load under specified conditions. Letters A to Z represent the certified speed ratings of the tire from 4.8km/h to 300km/h. Common speed ratings include: Q: 160km/h; H: 210km/h; V: 240km/h; W: 270km/h; Y: 300km/h; Rim specification: indicates the rim specification compatible with the tire for practical use, such as "Standard Rim 5.00F".

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