Another tyre conundrum

[ChrisSk]

I have just had to replace my rear springs on my 2.5 Zed and in doing so noticed that my tyre sizes are different.
Front - 225/40R18 88W. Rear - 255/35R18 90W, all runflats. I intend to replace all 4 when the time comes for Falken 452 but do I go for the same size all round or stick with these sizes?? I have 107s fitted and hope some of you can give advice.

Thank you.

 

[alansabout]

I have the same setup on my 3si I also went from runflats to falken's great tyre. That is I believe the right setup on the 3si so I think it is the same for you I kept them staggered

 

[mr wilks]

rear wheels are wider hence the need for wider tyres

 

[bigshurv]

The wheels/tyres are what are known as "staggered" which means larger rims/tyres on the back.This is common on performance cars.Stick with the same sizes are currently fitted,they are the correct sizes.