The TMD Chain Lock is a smart, keyless chain lock with a built-in alarm and superior protection.

No keys, no stress

Unlock without an app. No hassle. Automatically unlocks as soon as your phone is nearby (Bluetooth Proximity Unlock) — One press of a button and you're on your way.

Built-in Alarm

The built-in 100 dB alarm responds immediately to movement—turning passive security into active protection.

Powerful and stylish

The silicone lock body protects your frame, while a sleeve made of bulletproof Dyneema and Kevlar fibers encases the hardened steel chain. It offers optimal protection against cutting and brute force, yet remains soft and flexible in use.

Simple. Smart. Always connected.

The TMD Locks app does more than just unlock your lock. Share your lock with others (up to 5 users) and easily find your bike using its last recorded location.