Akira Akira
Teacher, Writer, and Director in JAPAN
The tire outer diameter calculation results below are calculated based on the tire standard and may differ from the actual values. We use a different formula from the usual formula so that it will be close to the real value, but an error may occur depending on the manufacturer, rim width, rim diameter, etc. In particular, the error is large when the tire width is displayed in inches. The results shown here are approximate calculated values and should be considered for reference only. In addition, we are not responsible for any disadvantage caused by the following calculation results. Please check directly with the retailer for accurate numbers.
This list is a list that displays tires with tire widths and outer diameters that approximate the tire size of 215/40R18 . The tire width is displayed in the range of -50mm to +50mm, and the outer diameter is displayed in the range of -30mm to +30mm.
If the outer diameter is different, an error will occur between the speed displayed by the speedometer and the actual speed.
The results of this tire size outer diameter calculation program are for reference only and may differ from the actual values. Actual numbers will vary depending on the manufacturer, brand and wheel combination. For exact numbers, please contact the tire manufacturer and dealer of the appropriate size and brand.