| Yes. Already exists: https://www.immobilise.com/view.php?stage=product&catego... Goes down the seat tube and is a one-way insert only. Cannot be pulled back out, and is too large to push down and get out of the bottom bracket shell. I actually have those installed in all my bikes. Far simpler though: Every one of my bikes is littered with very small notes saying "If this bike was not brought into the shop by David Kitchen it is stolen, please call 07740949xxx". Those notes are in the stem, under the bar tape, under the rim tape, in the bottom bracket shell, in the seat tube, in the seat post. Everywhere you can hide a small note whilst building the bike that will be found when servicing the bike. I printed them on plastic using a Dymo machine, they weigh nothing... and if my bikes were stolen then one day they will arrive in a bike store for a service, and be returned to me. |