Headline: TMD's keyless bike lock is a $280 solution to a $60 problem
Key facts:
- Price: €249 (about $283) for the keyless Bluetooth chain lock.
- ART-2 certified for insurance in Netherlands and similar standards in Europe.
- Hardened steel chain with Dyneema and Kevlar sleeve — flexible and scratch-resistant.
- Bluetooth proximity sensor automatically unlocks when phone is near.
- 100dB motion alarm deters theft.
- Battery life claimed at 9 months; test unit showed much faster drain in proximity-heavy use.
- Proprietary magnetic charging cable (no USB-C).
- Emergency unlock with four-digit code via button pushes.
- Available in 70cm, 110cm, and 160cm lengths.
- IP57 water and dust resistance.
In-depth analysis: Is the convenience worth the cost?
Smart bike locks have long promised to free cyclists from the tyranny of physical keys, but most have failed to justify their premium pricing. TMD, a Dutch company that cut its teeth securing ATMs for banks, aims to change that with the TMD Chain Lock. The lock combines a slender hardened steel chain with a soft outer sleeve of Dyneema and Kevlar fibers, making it both tough and flexible enough to wrap around a seat post. The real innovation, however, lies in its keyless operation: a Bluetooth proximity sensor that automatically unlocks when your phone is near, and a motion-activated 100dB alarm to scare off thieves.
But at €249 (about $283) for the 110cm model, the TMD Chain Lock costs roughly four times as much as an equivalent analog lock like the ABUS 8900 (around €60). This price gap raises the central question: how much is convenience worth? For urban cyclists who lock and unlock their bike a dozen times a day—commuting, running errands, picking up kids—the time saved and hassle avoided can add up. TMD’s lock also offers easy digital sharing, allowing friends or family to unlock the bike with their own phones, which is especially useful in bike-centric cities like Amsterdam.
The lock’s ART-2 certification is a strong selling point in markets where insurance requires a minimum security rating. In the Netherlands, for example, most insurers demand at least ART-2 for expensive e-bikes and cargo bikes. The TMD app even provides a digital log file as proof of locking in case of theft. This integration with insurance could make the lock more appealing for owners of high-value bicycles.
However, the lock has notable drawbacks. The proximity sensor can be a double-edged sword: if your bike is parked within Bluetooth range (e.g., outside a cafe where you’re sitting), anyone can unlock it. TMD offers no adjustable range settings in the current app, leaving you to either move the bike or turn off Bluetooth on your phone. If your phone is stolen, your bike becomes vulnerable as well, though the emergency code provides a backup.
Battery life is another concern. TMD claims up to nine months on a single charge, but in our week of testing, the battery dropped 16%—suggesting a real-world lifespan of six to seven weeks if the bike is stored near the phone. The proprietary charging cable (magnetic pin connector) is an annoyance; USB-C would have been more convenient and just as waterproof. On the positive side, a dead lock can be revived after just two to three minutes of charging, and the emergency code always works.
The lock is also noisy. Unlocking triggers a 75dB tone that draws attention to the bike and rider. TMD promises a future software update to disable these sounds, but until then, users must endure the beeps. The motion alarm, while effective at 100dB, can be triggered accidentally and then auto-shuts off after 10 seconds.
Despite these issues, the TMD Chain Lock is a well-engineered product that fills a specific niche. For cyclists who hate keys, need to share access frequently, or want insurance-friendly security with digital proof, the investment may be worthwhile. For most others, a €60 analog lock with a simple key will do the job just as well. TMD is already planning additional locks—an angle-grinder-resistant U-Lock and a GPS-equipped ring lock—which could create a cohesive keyless ecosystem. If your bike is worth thousands of dollars, the added convenience and security might eventually justify the price. But for now, the TMD Chain Lock remains a $280 solution to a $60 problem.
Source: The Verge News