Thinking of upsizing or swapping tires? Enter two sizes in P-metric format (width/aspect-ratio/rim) and compare diameter, circumference, clearance and how much your speedometer will be off.
Diameter, sidewall and circumference computed from the P-metric numbers.
See exactly how fast your speedometer reads wrong after the swap.
Keep diameter within ~3% to avoid rubbing and ABS issues.
All local β nothing is uploaded.
Wheels, ratios and speed.