GoKawiilI’ve seen lots of so-called “smart” bike locks over the years, but none so far could justify the added cost. A newcomer that got its start securing ATMs for banks is trying to change that. There’s nothing wholly unique about the TMD Chain Lock, but the combination of materials, performance, and insurance-friendly ART-2 certification makes it worth considering.
TMD’s first bicycle lock combines a Bluetooth proximity sensor and motion alarm with a slender core of hardened steel chain wrapped in a soft and lightweight sleeve of high performance Dyneema and Kevlar fibers. That makes this lock tough, yet flexible enough to conveniently wrap around your seat post when cycling. TMD also designed the keyless lock to be shareable with friends and family, and capable of withstanding shock, rain, dust, and extreme temperatures. That makes it highly suited to city bikes parked outside and ridden all year long.
I like the TMD Chain Lock I’ve been testing, but spending €249 (about $283) on something that typically costs far less is a big ask.
6 Verge Score TMD Chain Lock $ 280 $ 280 The Good Strong yet flexible lock won’t scratch bike
Digital key can be shared with friends and family
Convenient if you lock your bike several times a day
ART-2 certified for insurance
Loud enough alarm The Bad Very expensive
Lacks USB-C charging
Annoying operating sounds $280 at TMD How we rate and review products
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