tyre size change,,how much differance?

[mikeouk]

im currently using 235/40 18 ,there is a -1.24% differance in diameter if I use 225/40 18, being realistic does that matter at all?

 

[Shude]

im currently using 235/40 18 ,there is a -1.24% differance in diameter if I use 225/40 18, being realistic does that matter at all?

that works out as 4mm rolling radius difference, which if you think about it is less than worn tyres vs new tyres

Should be no problem.

 

[Chris Murray]

Are they for your R129? This should use 245/275

 

[Shude]

Are they for your R129? This should use 245/275

Yeah good point, while it is possible to run tyres the same width as the wheels, even narrower (see DE modified cars ) you run a higher risk of kerb rash!

 

[mikeouk]

Are they for your R129? This should use 245/275

yeh its a r129, its currently got 265/35/18 rear and 235/40/18 front, so am I correct in saying the tyres are undersized already?

 

[stats007]

Not necessarily - they were sized like that for certain AMG wheels.