>If you end up with a 15" wheel, with the same circumfrence of a 14" >wheel,
>than what the heck is the point of having the 15" rim?  I assumed that >the
>reason for going 15" would be for bigger diameter wheels for lower >RPM's at
>speed.  Just wondering what the reasons are- higher strength rims?  >Bigger mags?
>
I've often thought that myself. I think suitable 15in tires would be as
difficult to find as the 14in ones.