dave-r wrote:The 235s will be.....err 235mm wide.
Quite obvious, or? A funny thing is that I have a set of VERY OLD tyres that makes me wonder if it really is true. Here is the story: I have four tyres. All of them are mounted on
7" rims, two of the tyres are Firestone S660 215/60-14 and two are Firestone S/S Radials, 235/60-14. According to all rules, the 235 is a wider tyre than the 215 but that is not perfectly correct in this case.
Comparison:
215: Footprint width: 190 Maximum width: 220.
235: Footprint width: 190 Maximum width: 250.
(The footprint widths are hard to measure exactly.)
The only reasonable explanation I can come up with is that the manufacturer use different ways of measuring. Since both of these tyres are manufactured by Firestone, I find these differences a bit odd. Why would they have any intrest in measure them in different ways?
Maybe not much to discuss, I don´t know?