Kryptonite New York Standard Bike U-Lock, Heavy Duty Anti-Theft, 16mm Shackle with Mounting Bracket and Keys, Ultimate Security for Bicycles E-Bikes Scooters

I feel that my bike is super secure. This thing is heavy duty. It’s known far and wide to be a really good luck and when I went to lock my bike up my E bike that cost a lot of money I noticed that the bike right next to my bike had the same brand it was a lot older model, but it looked just as tough back then.

This is the most Kryptonite of Kryptonite locks, thick, strong, difficult to pick or cut through. Not impossible to defeat, used correctly, but about the best you'll get. Also, because of that: very heavy.What I don't like is the frame mount. No matter how it's mounted or adjusted, the mount (& lock) slides and pivots, often into the way of your pedaling, and with the size of the lock and the way the lock fits into the mount makes it difficult to impossible to mount out of the way (e.g., in the seat/cross/down post triangle).

Much heavier than you think. Yes the seller did list the weight, but in practice it feels much heavier. The additional weight is more than worth it if they're as difficult to break as advertised

The best

Pretty heavy and strong lock

Goog as always

The lock is sized perfectly to properly secure my bike. It is very durable and the design is universal. I highly recommend this lock.

Well, it's a Kryptonite U lock, so much better than any cable lock, (don't even waste your money on those if your bike has any value at all. You might as well hang a sign, "STEAL THIS BIKE!") If anything, use a heavy chain at the very least.The stronger "FAHGETTABOUDIT" version is just too impractical because it's so short. I want to be able to just slip this on when I park, not figit with trying to work it into a tight spot and maybe scratch the paint.It is ironic that the LIGHTEST bikes cost more, so we need a HEAVIER lock to secure them, and this monster lock is not light by any means.There's some misinformation about the "Protection" offer. It doesn't say you HAVE to have insurance (as some have said), but it looks like you DO need to register your Bike (and Lock) ahead of time. From their website:"Remember this is an OPTIONAL offer and you MUST register to participate in the Program." You also have to notify the police within 72 hours, and Kryptonite within 7 days. Probably the only sticky point is they want a pic of the broken lock or may even want to see it in person. A thief might just take the lock with him to prevent fingerprint ID.I've seen some complaints about it being hard to unlock after using it for awhile. I'm wondering if that's from thieves who tried to pick the lock but failed. They might have damaged the pins, trying to ram screwdrivers or whatever into it.I debated about buying two lesser locks for the same price as this one. Seems having two locks is preferrable, although no lock is completely theft-proof. Any lock can be defeated given enough time and opportunity, like leaving your bike outside overnight. I might eventually buy a 2nd Kryptonite down the road for my $2800 Trek Domane, maybe the "Lite" version to compliment this one.