– Kryptonite Evolution Series-4 LS Heavy Duty Bicycle U Lock Bike Lock with Transit FlexFrame Bracket (4-Inch x 11.5-Inch)

Solid and easy to use. Perfect for my electric. I couldn’t use the frame mount bracket because I couldn’t find anywhere suitable to mount it on my particular frame but it fits in my saddlebag so wasn’t worried.

Some of the reviews mention problems with the cylinder or the keys. They are previous to the 2017 " New-U" design. I think it is not fair to keep them here. I purchased a Kryptonite MegaLok back in May 1998. Twenty years after, in May 2018, the cylinder failed. I have been consistently parking my bicycle outdoors for the last five years, with plenty of rain in the previous months. We had to use an electric grinder (this reminds us that ANY lock, even the "9-10" rated, can be cut in seconds with a power tool). During these twenty years, I lost the keys three times. Every time I got a free replacement in my mailbox, overseas. That's why Kryptonite was my first option when I looked for a replacement. Since this model is not directly available in Spain, where I currently live, I had to buy an expensive Angus chain from a local German store as a temporary solution -but it was too heavy to carry it. The model I got is the longest, the LS, which is about the same length as the previous one I owned.- a few mm longer and wider. In my experience, a smaller lock is not very useful in a city with not too many parking racks. The keys are now stainless steel, and the lock has now a plastic sliding cover to protect it from the water. One of the first things I noticed is that the metal is now thicker than the one I bought in 1998. This is the opposite I expected. Also, the mounting bracket looks much better than the older one (that one lasted a few years). My bicycle frame (yes, I own the same bicycle I purchased along with the lock back in 1998!) is rather small, so I think the reviews that mention space problems to mount the bracket are misleading. The instructions give plenty of details on how to adjust the bracket, although the picture showing the recommended locations might be confusing. The lock does not have to be inside the frame, you only have to care about finding a position that does not impede your pedalling. The problem is that these instructions require the people buying this lock to be literate! :) (See attached picture) IMHO Kryptonite is one of those rare remaining American companies - like Oster and a few others- that still care about quality and customer service. And I want to add that I'm not being paid by Kryptonite to review this lock. ------ EDITION AFTER 3 YEARS OF DAILY USE: Now I notice the mounting bracket is about the same as 20 years ago. I had to tighten it too often, and I do not use it anymore. Instead, I carry the U lock hanging from the handlebar, facing down to lower the centre of gravity. I see Kryptonite has some room for improvement on this bracket. As for the lock itself, it is working like a charm. However, I recommend using a graphite powder lubricant at the first sign of difficulty opening it.

Really strong good lock

Initially this lock was great, but the key is now just spinning in the lock. Difficulties unlocking. Amazon says no longer eligible for return

Lock is kryptonite LS . I did not receive lock bracket with lock as stated . I've managed to get lock onto bike . Lock is strong and does the job . Lock is strong well made no issue with key jam and does not rattle on bike now due to them adding rubber bumpers so a good improvement. I have teamed this lock up with kryptonite 90cm evolution 4 chain so with 2 locks the crooks look elseware for a bike to borrow .

Very strong chain

Weighs loads and is very very robust, gold standard means that its going to be hard to get into. I have on a folded Brompton and it will fit frame and back wheel to most posts, I use a big double loop of 14mm to secure front wheel. I will not fit to frame when riding so my loss of 1 star is only down to the face that the metal fixing point on the left side of the picture is not removable and so care need to be taken when securing the bike as this has frame scratcter written all over it. I have secured with electrician tape but hopefully when Kryptonite issue the next gen they will make this part removable.

Solid lock but I had to send it back as I couldn't mount this thing on my large bike bike frame! Which is exactly why I bought this lock for "easy to carry around"

Excelente la medida perfecta y calidad superior, la dejo 2 horas en un centro comercial donde hay bandas que roban a diario y me da la tranquilidad y seguridad q necesito.....

Semble robuste. Idéal pour sécuriser 1, voire 2 vélo(s) à assistance électrique.

C’est le meilleur produit sur le marché. De l’équipement de pro.

No bike lock will stop a determined and well-equipped thief. That said, this one's more likely to cause them to pick on somebody else - if they aren't the sort who destroys what they cannot steal. I get a good-quality lock because I want to have a chance to ride home, not because I have an expensive bike, and in my experience, this is a good-quality lock. Also, from personal experience, use the lock at home, too, We lost a treasured hand-assembled hybrid to a B&E jerk who was after electronics - and rode off on an irreplaceable custom that I'm sure got torn up.

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