In high-traffic, high-theft locations, the 'best' solution is a system: an anchored chain plus a second lock on the wheel or brake disc. Certification marks like Sold Secure Gold/Diamond or ART 4/5 indicate independent testing.
Trackers add detection and recovery. Look for Thatcham-approved units with live alerts, internal battery, tamper detection, and an app for geofencing. Professional installation improves reliability and insurance acceptance.
Technique matters: keep chains off the ground and pulled tight; position locks inward to reduce tool access.
This page is neutral and factual. It isn't legal advice; always check the latest official guidance.