What does 225 40zr18 mean?
225/40R18 92Y. The first three digits on the sidewall of your tyre show the width in millimetres. For example, this means that if the tyres first three digital have been marked ‘225’, the tyre will then measure exactly 225mm across its tread from one sidewall to the other.
What’s the difference between r20 and zr20 tires?
ZR basically means the tyre is adapted for speeds above 149 mph. ZR tyres includes the speed ratings V(149mph), W(168mph) and Y(186mph).
Is ZR tire better than R?
R indicates that the structure is RADIAL. So, VR indicates that the tyre has a RADIAL structure and a speed index equal to V. There is therefore no difference between a ZR or an R tyre with the same speed index.