I have a chance to get a set of these from a guy I work with for $50. The hubs are drilled for disc brakes. I'm thinking I flip the rear wheel add a drilled track cog and ride the front with a disc brake.

Does anyone have any history with this method? Using a drilled cog on a hub drilled for disc brakes?

Here's a link to a picture and some reviews of the set.
http://www.mtbr.com/cat/tires-and-wh...88_157crx.aspx