What is the difference between 18-inch and 19-inch tires?

[MacAngelo]

18-inch and 19-inch tires have similar tire widths, and the rolling radius error is less than 0.4%, which means they should have almost the same footprint. Differences can be observed in the following aspects: 1. From the perspective of braking performance: There is almost no difference in dry braking performance between 18-inch and 19-inch tires. The dry handling performance of 18-inch tires is faster than that of 19-inch tires. In terms of wet braking performance, 18-inch tires perform the best. Cornering hydroplaning resistance is also best with 18-inch tires. Based on current objective data, there is almost no substantial difference between these two tire specifications. 2. From the perspective of subjective handling: During dry handling tests, the subjective feel of the tires improves as the size increases. The fastest lap times with 19-inch tires are not due to larger wheel sizes providing more grip, but because these tires offer sharper and more responsive steering, while 18-inch tires make the car feel softer and less precise. 3. From the perspective of comfort and noise: 18-inch tires transmit more road bumps to the driver, especially in the rear of the car. With 19-inch tires, comfort is significantly worse.