The Strongest Bike Lock You Can Buy

 Courtesy abus.com

What It Is: The top-of-the-line lock from the German security gear company ABUS relies on heavy-duty 10mm links and comes in four lengths, from 34 to 67 inches. A durable fabric sleeve covers the links to prevent paint scratches on your frame, and an automatic keyhole cover keeps out grime while thwarting lock picks. The lock body is similarly built of thick, hardened steel, leaving no weak spot for thieves.
 
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Why We Like It: The CityChain has been a favorite lock for commuting and running errands around New York City. Longer than a U-lock, it readily secures our bike to bigger poles like scaffolding (we only lock it to supports, never crossbars) and light posts. The large lock body and extra-thick links also make our bikes the hardest to steal on any block. Unlike a U-lock that can be secured in place, chains tend to move when a would-be thief attempts to cut them — which at 10mm is already a slow undertaking. What really sets the lock apart was a recent commute to the office where the chain slipped out of an unsecured pannier and spent 15 minutes getting run over by cars and delivery trucks. Despite minor tears in the fabric sleeve and scratches on the lock-body cover, the lock itself suffered no significant damage and fastened just as easily as ever once we reached the office.

Nitpick: With this level of security comes cost and weight. We used the shortest version, and it still clocks 4.5 pounds while running the cost of two high-end U-locks. However, with the extreme durability and protection we’ve witnessed, the Granit CityChain is an investment in your bike if you live in an area with high levels of bike theft.
 
[From $240; abus.com