Frequently Asked Questions
This is the tire size information. 255 indicates the tread width is in millimeters, while 40 is the aspect ratio, meaning the sidewall height is 40% of the tread width. R stands for Radial construction, and 19 is the wheel diameter in inches.
This tire size has an impressive tread width of 255 millimeters. When mounted on the wheel and filled with air, this equates to roughly 10 inches across the tire's outer edge. The thickness of the sidewall relative to the tread area is represented by the 40 in the size designation code.
For most of these high-performance tires, manufacturers recommend a cold inflation pressure between 35 and 40 pounds per square inch. However, it’s always best to check the vehicle placard or owner's manual for the exact specifications for your make and model. Proper inflation helps maximize tread life, handling characteristics, and fuel economy.
This size is common for high-performance sports cars, sedans, and luxury vehicles like BMW, Mercedes, Audi, Porsche and Infiniti. These tires offer phenomenal dry road grip and handling.
The tread life for these max-performance tires varies between 20,000–30,000 miles on summertime tires due to their soft tread compositions. Higher-mileage ultra-high-performance all-season tires may last for between 40,000–50,000 miles when well maintained.
