Kryptonite Kryptolok Standard Bicycle U-Lock w/4-foot Flex Cable

This is a seriously solid lock that gives you a real sense of security. The U lock alone is thick, heavy, and feels virtually tamper-proof. The included flex cable is a great addition, giving you more options to loop through your wheels or around awkward railings or posts. I’ve used it to lock both my frame and rear wheel with the U lock and then looped the cable through the front wheel. That versatility makes a big difference in urban areas where secure anchor points aren’t always ideal. While it is heavier than cheaper alternatives, the added weight feels justified by the protection it offers. I’d much rather carry a little extra bulk than come back to a missing bike. The lock mechanism is smooth, and the key turns easily without sticking, which I appreciate after past frustrations with cheaper locks. Pros: Heavy-duty and high quality Flexible locking options with included cable Smooth key operation Cons: A bit bulky for smaller backpacks It might be overkill for low-crime areas

My husband said it Feels really sturdy and well built. The lock mechanism is smooth and doesn’t jam like cheaper ones he's used. It’s got a good weight to it without being bulky to carry. It gives him confidence leaving his bike locked up. A proper bit of kit if you want security and peace of mind.

Great lock and cable, but I couldn't get the online registration for free replacement keys (in the event of loss) to accept the keys' number. Although I couldn't fit it in any of the recommended places (due to my drinks bottle) I am pleased with where I've managed to locate it on the front wheel fork.

I recently bought a nice road bike and wanted to spend a good amount on a good lock to keep it safe. With this lock it gives you great peace of mind. The mount is extremely easy to set up and the lock clips into it easily, it stays there really well and doesn't rattle around when cycling. The lock itself is rather big though, so I struggled to find a place to put it as I also have two water bottle holders attached to my bike. I've done it though but when the lock is attached, I can't have any water - hey ho, the bike is safe. The additional cable is great too for securing your front tyre so that doesn't get stolen either. Comes with two keys. Would recommend this lock to anyone really. It's very well put together, feels sturdy and well made.

Love it! Keeps my bike safe.

Great lock. Some one tried to cut it then gave up. I brought a extra one for my colleague at work.

Great bike lock

Got this for recently purchased second hand bike. The lock feels solid and mounting it was fine (watch a video first though). The additional lock is great for back wheel or kids bike next to mine. The key is sometimes awkward/sticky and takes a few times to get it to turn which is stressful when you're out and worried you might not be able to get back into your bike! Other than that it's fine and good value

La marca Kriptonite es una de las mas importantes y con gran experiencia en seguridad , en este caso para las bicicletas nos ofrecen un candado en forma de U muy seguro, resisten y funcional, manejando un precio accesible por el vendedor, se los recomiendo bastante ya que ofrece un alivio al dejar su bicicleta, claro tomando en cuenta aspectos de la localidad donde se encuentran, el lugar donde la encadena etc, pero es imponente para cualquier persona de lo ajeno, un aspecto a tomar es que cuando lo comiencen a usar, colóquenle afloja todo o dw40 para que no haya roces con la llave y la entrada esto por lo nuevo del articulo.

Safest lock out there, comes with 2 keys and with holder to be mounted on the bike frame

It's heavy - in a good way. Good reputation. Hard to pick, Nice size - 4"x 9" ID. Comes with a nice size steel cable to secure the wheel E.g. Interesting key design should be quite secure. The key action seems a little glitchy but it smoothed out after working the key back and forth for a while. I also oiled it liberally and that REALLY helped to smooth out the action. Also comes with a robust plastic bracket to hang the lock on when you're out and about. Seems to work well. I bought this to secure my new Segway Ninebot Max. I will update review if things change. I've only had it for one day so far. There is theft insurance available with this lock up to $1750, but you have to pay for it. $9.99 for one year, $29.99 for 5 Years. Anyway, for the money I don't think you can do much better. Recommended.

Well, my bike hasnt been stolen yet so thats a PLUS. There are a few CONS I'd flag for potential customers considering this lock: 1. The U-lock itself could do with being an inch wider; on many occasions it simply wont fit around a regular pole/post when you angle the lock to catch the frame and forks at the same time. 2. The wire rope could do with being a little longer as well, to make it easier to catch the front wheel and thread it through the U-lock. 3. The key sticks in the lock quite often and you have to coax it a bit or spit on it to get it fully seated in the barrel so it ill turn 4. The mount is poorly designed. It secures around the frame or saddle post with a strapping and just one allen bolt. This is insufficient and leads to the mount sliding and falling with any vibration from the road. Drives me mad. Anyway, they have a good reputation and I imagine that alone is a deterrent for potential thieves so thats good but if you want quick and easy locking, this isn't the lock for you.

I bought this to lock up my new e-bike, which is vastly more expensive than the ancient MTB it replaced. I wanted a lock that was secure enough that I could leave the bike outside a shopping centre, for example. According to the registration page for Kryptonite, this is a v.1 Kryptolock. The listing doesn't say which version it is. The lock is solid, strong, and large enough to fit around my large tyres, through the chunky back frame, and around a bike stand, locking the bike securely to the stand. The cable is long enough to loop through the front wheel and around the lock, providing you loop it properly. The result seems really secure, so casual thieves (which seem to be the norm in my city) won't take a second glance. Be aware that better equipped thieves can cut through both lock and cable quickly, so it may not work in a big city. My bike's frame doesn't have room to mount the lock, so I can't comment on the mount. I carry the lock and cable in my backpack and they are not too heavy for that. One common complaint is the key getting stuck part way in and so not turning. I did struggle with this twice, and a bit of silicon spray lubricant sorted it out quick-smart. I always close the protection tab over the keyhole, but regular silicon lubricant is clearly needed. With that the key is smooth and easy to use. This lock has so far been exactly what I hoped for. If I move to a more insecure area I would order a higher security lock, but why spend more money when you don't need to?