Yep, I thought the same thing but, I remembered a site I looked up for my brother who has a Yamaha TRX850 and they apparently also have the same diameter (50mm) forks as our beloved Dukes.
Here is the link:
http://www.zagazig.co.uk/TRXuk/upgrades.shtml It looks A LOT WORK but I guess there would be the benefit of light wheels and some of the best brakes on the road if going for the full package.
I wonder how a speedo drive would work or would it be time to get yet another mountain bike computer -
Good Luck - Frank
ps - Apparently RSV's have the lightest production wheels ever made but lets leave that for another thread
[Edited on 30-7-2003 by Iconic944ss]