Why....?

Question is.....Why?

Why R1? -
May be because....
-Size does matter...
-Weight counts..
-A 998 cc, liquid-cooled, 16-valve, DOHC, inline four-cylinder machine means something..
-6 speed transmission has one above the rest..

Why R15? -
May be because...
-errr....
-ummm...
-hmmm...

I'll again try tomorrow....!!