Kryptonite Keeper 712 Combo Bike Chain Lock, 4 Feet Long 7mm Steel Chain Heavy Duty Anti-Theft Bicycle Chain Lock, 4-Digit Resettable Combination Lock for E-Bike Scooter Road Mountain Bikes

I wanted a chain that was very secure, long, and with a combo. This one met every requirement. I also appreciate it’s not too bulky and the cover protects the bike frame. The combo is very easy to set and the locking mechanism appears very sturdy. Much better than a cable lock. So good, I’ve bought three of these.

strong and very flexible....easier to use than the u-lock. might not be as secure but i think that this chain is secure enough for urban locking (not overnight) but when doing errands etc.length is good for most situations but you would need a secondary cable if you also want to secure a second wheellock is easy to program and works well....and appears to be very strong.chain ans lock have some heft to it so if weight over security is a consideration, maybe choose something less secure but lighter

i have many of these locks and the price is right for them..

If you want a chain lock, this is a good choice. The chain is well built and the integrated lock seems sturdier than most (it is all metal rather than plastic and seems like it would be tough to cut through). The downside is that like any chain it is heavy. This particular model strikes a good balance between security and weight. Standard bolt cutters would have a tough time with this, but it isn't too heavy to carry. However, heavy duty bolt cutters will be able to cut this. I wouldn't use this in a high crime area (e.g. a major city or college campus, there I would use a sold secure or art rated u-lock). But it is great as a secondary lock (e.g. for locking wheels and accersories) or for use in otherwise secure areas (e.g. in a bike storage room or garage).

very secure feeling.

Very heavy so adds weight to your bike but I have a sense of security with this lock i don't have with my other ones. The combo lock makes it so I never have to carry a key around or lose it

I'm tired of carrying around a wad of keys when I go bike riding. This is perfect. Maybe not the best or highest rated for security due to memory lock but, I am no longer fumbling for keys.

The combination lock is a personal preference....A key would be easier and faster to unlock, but then you have to keep track of the key. If you've settled on the combination lock, there aren't that many to pick from and I think this one is the clear winner for casual use.