Originally Posted by
Lombard
As the photo below will show you, you are wrong:
Where did this come from? It doesn't look right at all. If you trace that red line representing the 25mm on the widest rim, vs the white line representing the same 25mm tire on the narrowest rim, you'll see that the red line is obviously longer than the white line. And you know the tire carcass doesn't grow when you change to a wider rim.