Kryptonite Keeper 790 Combo Bike Chain Lock, 3 Feet Long Heavy Duty Anti-Theft Sold Secure Gold Bicycle Chain Lock, 4-Digit Resettable Combination Lock for E-Bike Scooter Road Mountain Bikes,Black

The kryptonite keeper with the combo is the way to go. You don’t have to worry about losing the key. It feels very sturdy. Only con is that it is very heavy. Felt expensive when ordering but ensures your bike is safe and secure!

This is one beefy lock! It’s big, it’s heavy, and it screams, “Unless you brought your industrial-strength bolt cutters, I’m not worth the hassle. Go try that guy over there.” Now given that my bike is not too expensive nor particularly flashy, I don’t think I have a lot to worry about, but it is my only means of transportation so I’m keen to keep it and I think this lock will do the job. Plus, I can always use it in lieu of free weights when I work out or as nunchucks if attacked in a back alley. I went ahead and bought two. Not because I spend a lot of time in back alleys, but because it’s always nice to be able to do alternating dumbbell curls.On a practical note, the combination part of the lock is big, easy to read, and works like a charm. Which is good when you hit middle age and the eyesight starts to go. Now I can unlock my bike in seconds and be on my way instead of spending twenty minutes squinting intensely and running my fingers over the numbers, trying to differentiate between a three and an eight. If you have a cheap lock and are over 40, you totally know what I'm talking about.In summation…good design, great lock. Highly recommend!

Normally I don’t care for combination locks, as they’re too easily defeated. Even this massive lock can be defeated by a reasonably skilled pickier in 5-10 minutes using a thin probe. The main bicycle locks is the keyed version of this lock, and it uses a mostly pick resistant disc detainer lock mechanism. But I needed a second bike lock, and I didn’t want to deal with having yet another identical-looking key on my keychain.The pluses: The chain and locking mechanism and very tough, and can’t be defeated by bolt cutters or a hacksaw. About the only thing that can get through this chain is a cordless angle grinder, and thieves don’t generally use those in populated areas in the daytime. It’s a good medium security lock for a bicycle or motorcycle for daytime use. I wouldn’t use it at night in a large city or on a college campus.Minuses? The weight, for one. If you’re going to carry a lock this heavy, get the keyed version, which is much more secure. The combination is very easy to change, even accidentally- I’d have preferred that Kryptonite had put some sort of detent on the change switch, or otherwise made it harder to change. Normally you only change a combination once, after you buy it. If you do buy this, keep it locked, even when not in use.

Thick

Like other Kryptonite products, this lock is solid. It was easy to set up a custom combo and it provides a sense of security when locking up my e-bike. Of course, it’s heavy, but then so are w-bikes.

I received it couple days ago. Setting up a code was very simple. The lock itself is also simple. I did not encounter any problems with opening/closing the lock so far. It runs very smoothly and feels good.

excellent value.

Good, strong, solid, HEAVY lock. Just a bit too short. Another 6" would have been great, but then it would have been even HEAVIER. But I knew that before I bought it. My bad.Also, the number dial is hard to see and the first number slot does not move smoothly. And, you have to line up the numbers exactly or it won't work. I suppose that's par for the course, of course.So I just use it for extended parking in public places or in my garage. Next time I would buy a lighter lock for sitting at the coffee shop.