Check your vehicle tyres for a number that looks a bit like this: 195 / 70 R 15
- The 1st number is the width of the tyre in millimetres
- The 2nd number is the aspect ratio or tyre profile (this relates to the depth of the wall at the side of the tyre)
- R means it is radial construction
- The 3rd number is the diameter of the wheel rim in inches