OK, so I am amazed folk don't carry bank cards.
So... What about bike registration (as in for theft protection purposes, using frame number, not as in visible identification for grumpy gits to use to vent ire)? Don't folk register their valued machines
? Though I must confess I haven't updated our's since moving house, but the new folk in our old house know where we live.
For insurance purposes maybe but It isn't a protection against theft though is it, how can it be if there is no visible deterrant?
As a means to retrieve your bke, possibly but on the off chance that my bike/bikes are stolen (negligible) what chances do you think there is of getting them back due to the use of such a registry? Maybe if you are very very lucky and the bike is easily identifiable for whatever reason and/or rare you could have a chance of being found in the classifieds/ebay etc, however the chances are still very very slim, for mass produced bikes you've pretty much no chance.
I have photos of my bikes and know the components fitted to all of them pretty much off the top of my head down to certain types of bolts/specific brake pads, minor marks etc so I personally can't see any beneft at all.
If a person is so conscious of either being identified in the event of them being killed/so injured they can't say who they are and need to carry ID or that they feel the need to register their bike/s, great, i just don't see that it is that important in the grand scheme of things.