→ Nominal diameter: —
→ Nominal diameter: —

Format auto-detected per field. Try 225/65R17 (metric), 33x12.50R17 (imperial flotation), 28.5 (inches), or 724 (millimetres). Mix freely.

mph
Estimated speed
— mph
Nominal diameter change: — (similar nominal diameters)
Estimated difference: —

This estimate assumes the original tires gave an accurate reading and the vehicle calibration is unchanged. Nominal dimensions do not measure rolling circumference; tire model, pressure, load and wear can affect the result.

Comparison at common speeds
Indicated speed and conditional estimate
Indicated Estimated Diameter change
Distance during the affected interval
mi

Enter only the indicated distance accumulated with the changed tires, not the lifetime odometer reading. The estimate assumes the odometer recorded distance accurately with the original tires and its calibration is unchanged. A later tire change does not affect earlier distance.

Estimated distance for this interval: —