Tyre width
The nominal width of the tyre in millimetres, measured from sidewall to sidewall under defined conditions.
← Help & AdviceTyre size guide
How to read your tyre size.
Use the marking on your tyre sidewall to understand width, profile, wheel diameter, load index and speed rating.
225Width/45ProfileR17Wheel
Aspect ratio
The sidewall height expressed as a percentage of the tyre width. Here, the sidewall is nominally 45% of 225 mm.
Construction & rim
R indicates radial construction. 17 is the wheel diameter in inches that the tyre is designed to fit.
Load & speed
94 is the load index and Y is the speed rating. These codes must be suitable for the vehicle's specification.
Where to find it
Look on the tyre sidewall
You will usually see a sequence similar to 225/45 R17 94Y. The vehicle handbook or manufacturer label can also specify approved sizes and pressures.
- Check both front and rear tyres; some vehicles use different sizes.
- Match load and speed specification, not only width/profile/rim.
- Look for XL/Extra Load, run-flat or other specifications your vehicle may require.
- If changing wheel size, confirm the complete wheel-and-tyre fitment rather than guessing an equivalent size.
Ready to shop?
Shop tyresUse the size you have confirmed.
Search the live MV Tyres catalogue by width, profile and rim diameter.