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Kryptonite's new WheelNutz are locks for your axles designed to prevent thieves from stealing your wheels. The lock works by only allowing the nut to be loosened when the bike is upside down. When right-side up, pins engage inside the mechanism preventing the bolt from being unthreaded. It's currently available in M9, M10, and 3/8" thread-on sizes, and may be available in standard MTB axle sizes in the future. The concept allows you to carry just a small lock for your frame, rather than having to have a long cable lock to secure your wheels as well. The locks have a lifetime warranty and go for $31 a pop.
Credit
Brandon Turman
