I recently needed to travel internationally with my bike to an Ironman event and figured it’d be a good idea to fit by bike with an AirTag so that I could track it, in case there was any logistics issues and for a little bit of added security.
I designed and 3D printed a holder to fit within the seat post of the bike, which slides into the bike seat tube and remains concealed. There was an option of fixing the tag to the inside of the frame using an adhesive, however the tag requires its batteries to be replaced every ~12 months, so the requirement to be able to remove (easily enough) had to be inherent in the design.
There are a number of commercially available AirTag holders that fit below the seat, or under bottle cages, but given my bike geometry and decreased security, I decided to design my own. The AirTag is still able to tx/rx through the carbon frame and works well!
