I picked No/Other...
I think that isolating the stolen bike into stickies or a different forum would only cause people to ignore them. I probably wouldn't on a typical day check out the stolen bike forum or thread.
I think the best method is to post in the appropriate forums... more eyes will see it.
However, I think if there is a way to grant "temporary" stickiness for the first week or two it would be nice (depending on the number of stolen bikes reported here).
To track the multiple threads in multiple forums (which is a good idea to maximize visibility) just subscribe to each thread, and you will get notified if there is a response. Also have the person either send a PM or an email if they have possible information on the bike.
Just my thoughts.