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What is the diameter of a 21-inch wheel hub in centimeters?

1 Answers

HenryLynn

07/30/25 6:14am

The diameter is 53.34 centimeters. 21 inches refers to the wheel hub diameter, where 1 inch = 2.54 centimeters. 21 * 2.54 = 53.34 centimeters. This is not an exact value, just an approximate figure. Wheel diameter: The wheel diameter affects the driving force required by the engine. The larger the diameter, the greater the driving force the engine needs. In city driving conditions with frequent stops and starts, larger tire diameters result in higher fuel consumption, while smaller tire diameters offer better fuel efficiency. Aspect ratio: Generally, the larger the aspect ratio, the thicker the tire sidewall, leading to greater rolling resistance. Tires with smaller aspect ratios have thinner sidewalls, and the part of the tire in contact with the ground deforms less, resulting in lower dynamic resistance and better fuel efficiency. In addition to the model, tires are also marked with the following common data: 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 defined 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 size compatible with the tire, making it easier for practical use, such as standard rim 5.00F.

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