TMF (Misserden Flyer) did a vid on using air tags on his bikes. According to the review, complete waste of time.I get the anyone can find out bit, but equally, if the opportunist nicks a bike and you have hidden the tag really well, causing them a lot of time and hassle finding it, it could be a decent back up. My son't school has a problem with school bags going missing and I was going to fit one of the air trackers (Elevation Tag Vault) to his which are designed to be stuck or sewn in.