Kryptonite Evolution Long Shackle Bike U-Lock, Anti-Theft Security, 14mm Steel Shackle with Mounting Bracket and Keys, High Security for Bicycles Scooters,Black

I’m aware that I could’ve bought this item for less if I hadn’t been in such a hurry, but I needed a new lock fast. I got it from 365 Cycles because it included next-day delivery. Kryptonite’s mounting instructions are terrible, and the wrench is useless. Despite those two irritations, I’m still giving it five stars, mostly because of fast delivery and a quality brand. Also, the locking mechanism on the Evolution New-U works more smoothly than the Keeper.

Kryptonite is an industry standard for a reason. These locks are easy to use, and while heavy and a little bulky, give a good feeling of security. The longer shackle model of the lock can be a little bit harder to store on a bike however, especially if you use bottle cages. The mounting system for storage has been upgraded from previous lock models. Previous Kryptonite locks I have used included a plastic clip that was hard to attach and detach from the lock without breaking, not to mention a nightmare to install on the bike. With the new mounting kit, the plastic components are a little bit larger, but much more robust. The release mechanism feels less likely to snap, and the installation of the kit includes the use of a webbed strap and metal buckle (the bike is protected by a rubber insert) that firmly attach to the bike frame. Be cautious, however, that bike frames with non-round frame members can be a little hard to attach to.

Fits very nicely and with good distance. Nice strong lock.

Way able to use this to lock two bike together on a bike rack and have peace of mind. It is frustrating to have to carry an extra key, but overall not a big deal.

Heavy, but does the job. I use 2 locks to make things more difficult for thieves.

This is a sturdy lock, somewhat cheaper than the "forgetaboutit" New Yorker, and there is a reason, but you need to see the "lockpickinglawyer" on youtube for the explanation. But it does come with a 1 year insurance policy, which requires you send them the broken lock and your bike needs an appraisal. This is an AWESOME lock. If you haven't used a u-lock, this is the one you want to give a try. The lock is hard to unlock, but use it a few times you will get it.

I saw some negative reviews regarding "key/lock would not work". That happened to me, so I took closer look at the lock and noticed the one rubber ring that aligns the lock cartridge was out of place. When I aligned the rubber rings correctly, all was well. So first check the rubber ring alignment if having trouble.

I really liked how strong and safe this lock was. The only thing that was an issue for me was its size and weight. I needed a lock that I could install on my bike, but I could not find proper space on my bike to install this lock. I had to carry it in my backpack.