Kryptonite's EZ Mount Bracket makes it easy to carry your U-lock so it's always ready. This nice mount fits on frame tubes from 0.875- to 1.5-inches in diameter. And, it accepts all 13mm- and 16mm-diameter round-shackle U-locks on the market today. Plus, the quick-release button allows easy loading and unloading of the lock, too.
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The mounting bracket is theoretically a great advance on the previous collar. No need to fiddle with unlocking while lock is mounted. BUT huge BUT I am having to do massive amount of filing and carving to stop the collar from virtually seizing in the shaft.