Kryptonite Evolution Series U-Lock 4"x9"

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The Kryptonite Evolution Series U-Lock 4"x9" is a workhorse security tool built for riders who take theft seriously. The compact 4"x9" shackle dimensions keep leverage opportunitie s minimal while still fitting around most frames, forks, and street fixtures — a balance that matters when you're locking up in real-world conditions. Kryptonite's Evolution line sits in the upper tier of their range, designed to resist cutting, leverage, and picking attacks that defeat lesser locks. If you're leaving your bike unattended in medium-to-high-risk environments, this is the kind of hardware that earns its place on the bike. Show more