What is the size difference between 19-inch tires and 20-inch tires?

The key to understanding the ground clearance between a 19-inch wheel 45 tire and a 20-inch wheel 40 tire is to understand their size and tire height. The difference in diameter between 19-inch and 20-inch wheels is 1 inch, that is, 1 inch is equal to 2.54 centimeters, so the radii are 9.5 inches and 10 inches respectively.

The tire height is relative to the wheel hub, usually expre ssed as a percentage. For example, 45 means that the tire section height is 45% of the width. For a 45-series tire on a 19-inch wheel, the height is calculated as 9.5 inches times 45%, which is approximately 4.275 inches (10.85 cm). The height of a 40-series wide orange car tire on a 20-inch wheel is 10 inches times 40%, which is approximately 4 inches (10.16 cm).

So, theoretically, the ground clearance difference between a 19-inch 45-inch tire and a 20-inch 40-inch tire is 4.275 inches minus 4 inches, which is approximately 0.275 inches (about 0.7 cm). However, the actual height difference from the ground may vary due to factors such as the vehicle suspension system and the elasticity of the rubber material.

In general, the ground clearance between 19-inch 45-inch tires and 20-inch 40-inch tires is about 0.7 centimeters.

The height of a 20-inch tire is 50.8 cm, while the height of a 19-inch tire is 48.26 cm, so the former is about 2 cm taller than the latter. Although this height difference is not obvious, there is a significant difference in wheel size. The difference between 19-inch and 20-inch tires is that the larger the size of the wheel, the flatter the tire is, and the more visually tense the vehicle looks. The controllability will also be more stable.
In terms of comfort, 19-inch tires are more comfortable than 20-inch tires, but they are slightly worse in terms of handling. Therefore, when buying a car, choosing tire size should be based on personal needs.
In addition, the price of 20-inch wheels is more expensive than that of 19-inch wheels, but the visual effect is better because of its larger size. However, using tires with a small puncture rate will reduce comfort, but it can improve the car's handling and grip, reduce tire deformation when turning, and suppre ss the body's roll range.
The wheel hub is the rotating part of the tire, connected to the inner contour of the tire, and is also the metal component that supports the center of the tire. According to the characteristics and needs of different models, the surface treatment technology of wheel hubs will adopt different methods, which can be divided into baking paint and electroplating.
Methods for maintaining wheel hubs include avoiding using cold water for cleaning at high temperatures and cleaning the vehicle regularly to avoid salt corrosion.
Finally, when choosing tire size, you should choose it based on your personal needs. Large cars can choose slightly larger tire sizes, while ordinary cars can choose according to their needs. For example, if you need better stability, you can choose larger tires; if you need lower fuel consumption and faster acceleration, you can choose smaller tires.