Tire size calculator
Type one or two sizes. Results update as you type. Works with metric (265/70R17, LT285/75R16) and flotation (33x12.50R17) sizes.
Tire sizes
Try:
Results
Solid blue = A, dashed orange = B. Left: side view with both tires on the same ground line. Right: tread view showing height and width. Drawn to scale.
The link keeps both sizes.
Speedometer error
If your speedometer was set up for size A and you fit size B:
Metric ↔ flotation converter
Metric sizes come in fixed steps (widths ending in 5 mm, aspect ratios in steps of 5), so the closest metric size is rarely an exact match. Always compare the real diameters.