How do you read tire sizes?
The first number to appear in your tire size information is the width, in millimeters, of the correct tires for your vehicle: P225/70R16 91S. Tire width always refers to the measurement from one sidewall to another.
What does 265 55R20 mean?
265/55R20 tire has a width of 10.4 inches or 265 mm that reflects the measurement of tire’s width from its inner sidewall to its outer sidewall at the widest point (excluding decorations, protective ribs or raised letters). Tire width is also called tread width, section width or cross section width.
Which tire width is fastest?
30mm-width tire likely comes down to how the manufacturer makes the tire, more than anything else. Using a 26mm tire only really makes sense if you’re consistently riding at professional race speeds, due to its better aerodynamics. For the smooth and flat bike path test run, the 30mm tire was the fastest.