GPS Trackers.
A hidden tracker is the recovery plan locks cannot promise. AirTags are cheap and effective; dedicated trackers add motion alerts.
1Check price on Amazon
AppleTop pick
AirTag
Cheap, tiny, and backed by the biggest finding network there is. Hide one in the frame or under the seat (iPhone required).
2Check price on Amazon
Knog
Scout Bike Alarm & Finder
Bolt-on tracker with a motion alarm, Apple Find My support, and a 2-month battery.
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