Kryptonite Keeper 12 Standard with Bracket Black

Very strong build and lock quality. It is very easy to use and the added mount makes it easy to carry.however it doesn’t fit well in most things to lock it on.

Great lock for any biker. Feels very solid and significantly less bulky than the Sigtuna lock I bought when I first got into biking. Only bugbear for me is, as with any U-Lock/D-lock, the rattling when you ride with it but this is easily remedied with some rubber O-rings, a minor niggle perhaps but you'd think a major company like Kryptonite would have figured it out by now

A quality product at a nominal price. I have to bought this as my old lock from Halford decided to not work anymore. It’s lighter than my old lock. In my use case I wished if the bracket was a little smaller, as I needed to mount it on the side of frame close to wheel. Comes with two keys. You do feel a little bit rattling when it’s mounted on the frame.

Gang of 5 twits on mopeds tried to steal my bike outside my work. After a couple of minutes hammering away at the lock, they were chased off and my bike is safe. My other lock, a simple combination lock, was smashed and ripped off easily.

Bought this a few days ago to replace an OnGuard combination D lock that failed (the combination seized up, fortunately as i was about to fit it to my bike). This lock looks good, it's not too heavy and I eventually managed to fit the bracket to part of my bike. The business end of the keys don't look too sturdy so slowly and carefully locking and unlocking seemed to be the key (!). I already have a cable from the OnGuard purchase so i will incorporate this with the lock. Looking forward to using it when it stops raining.

Very flimsy lock. I read some reviews saying that but thought that people over-exhagarated. I believe they didn't. It is quite difficult to use it- the key doesn't come out when you unlock the lock, so you have to 'lock' it, take it off the bike and then again unlock and lock both parts. The bent side doesn't fit easily and when locking it takes some time and effort to put it together. The holder is very poorly made- one of the screws fell out whilst I was cycling, luckily I didn't lose it all or that it didn't all fall off when moving. I will look for another lock and will give this one to my son for his bike when he cycles to school or use it as a second lock.

The lock itself is very sturdy and more than adequate for my needs of locking a bicycle outside a supermarket. It's quite weighty and feels robust. Opening the lock was initially a bit fiddly but once used to it, is no deal breaker. The keys can be registered and, allegedly if you do, you'll receive a free replacement set if you lose the two supplied keys. The lock is supplied with a bracket to secure the lock to a bicycle frame, which was a key feature for me, and the holding bracket has a quick release system - simple button. But mine was supplied with the bracket fixing bolts and washers but no securing nuts which is both very frustrating and says something about their shipping quality control. Such a shame that my opinion of an otherwise good product is skewed because someone couldn't bother to check the product pack list. :(

Excellent padlock for bicycle security. I ride a lot of bicycles both to go to work and to go to the center to study and that is why I often need to leave my bicycle in different places, as I have a bicycle that I believe to be very good, all safety is welcome, that's why I purchased this padlock together with a steel cord to lock the frame and bicycle wheels. The padlock is great, I choose to carry it in the backpack but it comes with a support that you can put on your bike, the padlock comes with two keys, and has extreme quality, resistance and security, passing the security so that you will leave the bike anywhere and be calm, I loved the product and recommend it to other people.

Le produit et un bonne antivol d'appoint pour les arrêts minutes il permet de sécuriser la roue arrière en passant dans les hauban. Ce U est un bon dispositif il coûte aussi cher qu'un câble pour une sécurité accrue grâce entre autre à sa serrure à disque il est également très intéressant de part son système de fixation au cadre qui fonctionne très bien ( petite astuce si comme moi vous avez un vtt mettez le support derrière le tub de selle ;)) Enfin bref bon antivol pour les arrêts minutes mais pas plus car pas assez sécurisée.

Looks solid, accepts by insurance companies and i still own my bicycle

If you care enough to buy a lock for your bike in the first place, then you should care enough to get a lock that works better and easier than another lock, on top of giving you great security, so you will get into a habit of employing it all the time and not be lazy because the lock takes more effort to use. Lazy? Yes, and laziness is the biggest reason to not use a lock you bought to protect your bike. Just having a strong U-lock isn't good enough. You have to use it. An unused lock is the worst security feature a lock can have. Easier, with top security features is just better. You'll use this Kryptonite lock and that will save your bike more times than you will ever know. I put it in the same realm as building a better mouse trap. Having returned an On-Guard 5510 Mini U-Lock with Additional Security Cable (4 feet) to Wal-Mart where I had bought that lock, I chose this Kryptonite lock instead because, although On-Guard claims to be "obsessed" about security they sure aren't when it comes to product design. Bottom line is if you have a lock that is not as easy for you to use, then you will of course use it less and take a bigger risk with your bike becoming a crime statistic (stolen). Amazon had Wal-Mart beat on price for this Kryptonite lock, too. Comparing Amazon's service to Wal-Mart's wouldn't really help, since Wal-Mart forgot what service is years ago, and Amazon has consistently provided me with better service in all areas for many years now. Shipping for this lock, along with Avenir Tightrope Cables (12mm / 7 feet) - to make securing my bike a more complete security system for my wheels and saddle along with making more work for a would-be thief - and a Bell Dawn Patrol LED Headlight took just 4 days using Super Saver shipping, and you can't beat that. My Planet Bike Blinky "3" 3-Led Rear Bicycle Light , that I purchased at the same time, was packaged and sent along separately, but still arrived on the same day. Look for those reviews from me, too, should you like this one. This U-lock is very tough and I don't think you could easily find something that would cut through it, at least not something you could easily carry with you and go unnoticed. Seems more like someone would have to use a diamond wheeled grinder type of cutter with a power drill, at the very least, and that sure wouldn't be discrete or fail to draw attention. So while someone would not be able to easily steal your bike with this lock - if properly secured - for errands, short trips to a store, or in a busier type of place where you could even leave your bike all day, it won't be for you if you leave your bike in high-crime areas. I wouldn't trust this lock to be the only means of securing your bike at night for a long period of time or in an area with few people around and little activity during the day, as people being around and seeing your bike is one step in your security plan to make stealing your bike a less attractive option for a thief. One thing I really like about this Kryptonite lock over the On-Guard U-lock is that while On-Guard uses a dual, straight bayonet system on both sides of the locking arm to attach to the shackle, this Kryptonite U-Lock has an easier and better system to attach the locking arm onto the shackle. It's not dual, straight bayonet on both sides. One side of the locking arm of this Kryptonite lock has a short, angled part of the locking arm that helps you to guide and fit the locking arm into the shackle for that side, then you just swing the locking arm around the frame of your bike and a stationary object and clasp the other side of the locking arm (which has a straight bayonet fitting) into the other side of the shackle, then lock it by turning the key. To me, Kryptonite's is just a better design that makes attaching the locking arm to the shackle a little easier in warm, dry conditions and especially easier in cold, wet conditions. It also makes it easier to attach the locking arm to the shackle by obtaining a little leverage, if needed, for those times when you have to use a stationary object (like a pole) that is larger in diameter than some others when you lock up your bike. The dual, straight bayonet system for the locking arm with On-Guard's lock makes you press down and use compression alone (your muscle strength) for attaching the locking arm to the shackle. Kryptonite's design, with one side of the actual locking piece of the arm at an angle, lets you lock that side in and pull as well as push down on the locking arm if you need to. As luck would have it, since I have received this lock the weather has taken a turn from nice and warm to colder than a mother-in-law's kiss, with ongoing cold rain or drizzle and I have really found out just how much better Kryptonite's design and locking system works, which means it just makes it that much easier to lock up my bike. Locking up my bike properly is a habit I don't want to break. If a lock is more of a pain in the butt for me to use, like the dual, straight bayonet system On-Guard uses in their U-lock design, then I'm less likely to use it all the time, which means a thief will be more likely to take my bike. And that would make me sad. In short, you spent your good money on your bicycle purchase. Spend a little more and get a good U-lock like this one, or a stronger one if your area is more of a high-crime/high risk area, and use it along with a good cable like the Avenir Tightrope Cables (12mm / 7 feet) . Little out-of-pocket cash, but you will have a security system that will intimidate most thieves, so the opportunists will give up without even trying and the more determined thief will move on to an easier target. For those interested in Kryptonite's Anti-Theft Protection offer, yes, you can register the lock and your bike with Kryptonite. You must verify your bike's serial number and purchase price with Kryptonite plus pay a yearly fee, along with other requirements and restrictions. It is all detailed in the enclosed package with the lock, and is available on Kryptonite's website if you want to know more.

Tenemos dos en casa, de momento no nos han robado las bici 😂 se ven fuertes y son prácticos de llevar

Cannot be broken. Need not saying anything else.