KryptoniteKeeper Folding Bike Lock, 2.75FT/3.25 FT Long Compact Lightweight High Security Anti-Theft Foldable Bicycle Lock with 2 Keys and Mount for E-Bikes Scooter Road Mountain Bike

I am rating the lock not Amazon's delivery, so I'll give it 5 stars. The lock is sturdy and easy to mount and use. No, it wouldn't stand up to a grinder, but I never leave the bike out of public sight or for very long. It's not too heavy and fits my folder perfectly. Next day delivery took over a week and a customer service call but other than that it was great.

StrongLock quality:Ok

Best lock I have ever used, e-bike 2 locks works great

This is a good medium-Security bike lock, very compact, packs easily and securely into the provided carrier. The carrier mounts to standard bottle bosses, an ideal storage solution.I bought the smaller size, which is large enough to secure the frame and rear wheel. I wouldn’t trust this lock for overnight storage in an exposed area, but for use during the day while dining or shopping it should be adequate.The keys are a bit fiddly, the lock mechanism doesn’t feel that solid, but that’s probably one of the trade-offs when using a lightweight lock, and this lock only weighs about a pound and a half, the same as a 24 ounce water bottle.I’m sure any determined bike thief can defeat this lock, but it’s more secure than a steel cable, and a lot easier to use than a U-lock, and easier to store on a bike than any other design.

I had to graduate from a simple cable lock for my beat-up hybrid bikes to something a little more secure for a modern Class 3 E-bike. This folding lock is moderately secure, enough for shorts stops and more where I ride. The length is sufficient to lock a bike frame around a good size post or other sturdy object, and simple to operate. While it's not light, it's not ridiculously heavy. Most importantly, it easily fits into the side pocket of a small rear rack bag. The lock itself is coated with a soft material so it won't scar your bike during use. Not as secure as a U-lock, but more versatile. And not as heavy or as bulky as a similar size chain lock. Seem like a good compromise between security and weight for those riding in a rural or suburban environment or for short stops for lunch or shopping.

The lock is great but won’t stay mounted it is always falling or sliding around probably going to be home when I need it

The flexible hinges allow you to wrap this around, oddly shaped objects. It folds up nicely and stows on the bike easily. I lock and unlock my bike multiple times per day and this particular bike makes that task much simpler and quicker.

Great lock for the price. It isn't maximum security but in my relatively low crime are it does the job. Attaches right to the frame and works great