I am messing around with the geometry of my bike and am interested in running a 21" front rim.
A Kenda k270 tire with dimensions of 2.75"x21" is only 26.3 inches diameter and the same size Shinko 241 is 27.2 inches!
I currently have a 19" in front and a 2.75-19 is only 25", I like the idea...