Need a tenacious lock to last you years of rides and commutes? The ABUS Granit X-Plus 540 U-lock should be on your short list. Cliche as it may sound, this German-made product starts and ends with quality. Bike locks aren't feature-rich, but ABUS made sure to throw in a few user-friendly surprises, including an automatic dust cover and a sturdy-as-heck frame mount. And when it comes to high security, this is about as lightweight as it gets. It scores well across the board, with its only major drawback being its high price.
Competition among high-security locks was fierce. The best of the best leaves little room for shortcomings. This lock went head-to-head with the Kryptonite New York Standard U-Lock and came up just short. In the end, the New Yorker is slightly more secure and accompanied by an anti-theft protection program, which pushed it over the edge. If you want the best of versatility and security for overnight lockups, check out the Kryptonite New York Fahgettaboudit Chain and Disc Lock.