Pretty unlikely anyone would steal your rack. They'd have to undo 4 bolts and that would take too long to risk it for just a rack. If you get a lightweight cable to secure your seat (it has a loop at each end - you put it through the seat rail, then through itself, then place the free end loop around one arm of your U-lock) it would probably be long enough to also go through your rack adding a little protection.
Last edited by cooker; 07-16-06 at 10:39 PM.