Can a tubular tire be reused? I have some knobby cross-specific tubular tires (Challenge Limus 33) mounted on a bike and I want to change them in exchange for slick tires for a period of riding primarily on the pavement.  While they are excellent tires, and have a lot of life left, the road noise is undesirable.

Can these tires be reused after they have been separated from the rim tape and/or glue?
Yes, you can reuse them. 

Just be careful removing the old ones, clean them up and then swap on the new ones.