I think it is a great idea. Just imagine how you would treasure some voice from the past discovered in your bike?

In a related note, I had to do a quick and dirty plumbing job on my house in California a few years ago. The fix will hold forever, but it was very non-standard to say the least. I wrote a note explaining it in sharpie on the stud next to it before plastering over the hole in the wall. I hope whoever lives in that house in 20 years who has to deal with it will forgive me.

jim