It just depends which size is more common I guess.
Another random question I've got, is it better to increase the width of the tyre or the aspect ratio? I am under the impression that increasing the width would improve handling, whereas increasing the aspect ratio would improve comfort? Therefore;
- 215/45 R18 - Standard
- 225/45 R18 - Better handling
- 225/40 R18 - Less comfort
I know we could only be talking about a few millimetres here but I am just trying to get a better understanding.
225/45 won't be better handling... it will be a taller tyre and wider - this doesn't mean better handling especially if it is a "standard" road going tyre.
stick with standard sizing.