Compare two tire sizes side by side to see the difference in overall diameter, sidewall, circumference, and speedometer reading. A fast tire size comparison before you change setups or go plus-size.
Comparison
Size Comparison
Tire A vs Tire B — drawn to scale, same center.
Reading a tire size comparison
The bigger the difference in overall diameter, the more your speedometer, ride height, and gearing change. A taller tire makes the speedometer read slower than your true speed; a shorter tire reads faster. Keeping a new size within roughly 3% of the original keeps your speedometer accurate.
Use this tire size comparison to plan a plus-size or a wider setup, then check fit with our wheel fitment calculator and size a single tire with the tire size calculator.