Originally Posted by
noglider
Dork disks are very useful but ugly, and experienced riders find them repugnant.
The ideal, of course, would be to have a rear hub with a flange larger than the largest cog in your freewheel. And maybe even a little lip that catches the errant chain.
Maybe like this:
http://alexandchristine.smugmug.com/...07_niuJg-S.jpg