The Kryptonite Evolution Series 4 STD U-Lock is constructed of hardened steel, and it provides high security through a number of strategies. The short crossbar and shackle create a compact fit providing better security, and the disc-style cylinder resists picking and drilling. The 14mm steel shackle resists bolt cutters and leverage attacks. The Kryptonite security rating for this lock is 8 out of 10.
Kryptonite Evolution Series 4 STD U-Lock Specifications:
Size: 4x9" w/14mm shackle
Includes: Three stainless steel keys - two standard "I" keys and one LED lighted key
I bought this u-lock after a bit of online research looking for a good lock to send with my daughter to college. I was impressed with the construction of this u-lock and see they have evolved since my early-generation u-lock that I had in college! I appreciated the mount that came with the lock and found it easy to install on the bike frame. However, the lock + the mount is large enough that I could not fit it within the frame triangle of my daughter's Trek X-Caliber. After a lot of trial and error I found a way to use the mount slightly out of alignment with the frame which allows the lock to rest alongside the main triangle of the frame.
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