tyre size worries me

[michaelb]

Yup as others have said, the 40/45 is a percentage.

I have 235/40/18 front and 265/35/18 rear.

Mate, I am still a bit lost with it, persantage of what? What is on the road and the height of the tyre?

Regards,
Michaelb

[efiniste]

My radar detector is already telling me that my speedo is showing more sspeed than I am doing and that was before the change ...

Regards,
Michaelb

Unless you are Lewis Hamilton in disguise you\'ll find that happens with every car you drive.

Tyre numbering is as follows:

245/40 17

245: width of the tread in millimetres
40: sidewall height as a percentage of tread width
17: wheel size

The lower the middle number, the harsher the ride and the quicker it will break away when cornering (less tyre sidewall to flex).

Your current setup is 10mm narrower in tread, front and rear, than a standard FD on factory 17" wheels.
Your sidewalls are 4mm smaller at the rear and 4.5mm smaller at the front than a standard FD on factory 17" wheels.

Personally, I wouldn\'t worry about it.