They said it could not be done. However, you really can polish a turd! Dubs for my 600. I finally found some very hard to find 175-50-13 inch tires for my 1970 AN Honda 600 microcar. Finding the right combination is tricky. These wheels are 108mm bolt spacing and fit, but, 110mm is required. As you can see the 13 inch combination is close to the same height as the original 10 inch set up. Dubs! haha.
http://www.youtube.com/watch?v=BkVP4CRbfGk
Mark Portland Or.
http://www.mphspecialties.com/