Kryptonite Evolution Mini Bike Chain Lock, 3 Feet Long 10mm Steel Chain Heavy Duty Anti-Theft Sold Secure Gold Bicycle Chain Lock with Keys for Bike, Motorcycle, Scooter, Bicycle, Door, Gate, Fence

Okay I've read a LOT of reviews on this lock. Let me help summarise for you. 1) The key and unlocking: It unlocks just fine. The key has to pass through one or two elements in the chamber to be fully inside. These elements are what adds to the security of the locking system. Once the key has been gently inserted it will open again and again no problem. It truly is pretty damn simple to use and so far I've had no issues with the key. 2) The weight: Its 2.7 kilos. Its got some weight and is a little heavy but it's not weigh your arms down "oh my god" heavy at all. It feels not much heavier than a light bag of groceries to be honest. I was concerned with the reviews and figured... How heavy can 2.7 kgs really be. The answer is I'd happily carry this around in my bag or on my bike. Yes it's not a mega lightweight lock but it's also not an anchor either. My girlfriend is also buying one and she's happy to use it for her bike too. 3) Registering of keys on the Kryptonite website. My girlfriend had my keys registered online for me in the time it took for me to make her a cup of tea. No problem at all. So that hopefully gives you a better idea of the key, weight, and registration. I spent a few days looking at other locks and honestly, Kryptonite are still the market leaders and the small doubts I had about this from reading the reviews were quashed within 5 minutes of opening and using it. Enjoy this great lock for piece of mind... Remember it's not just the insurance payout you want... You just don't want your bike stolen in the first place. Pro tip however... Combine with another lock and never forget if you have quick release wheels to lock them to the frame. One last point is this locks length. It's long enough for me but if you did want a fair amount of length for locking two or three bikes together you might want a longer version... But with more length comes cost and of course more weight. Ride safe

I've been using chain locks for about 15 years, mostly to lock motorbikes. This is perfect for my bicycle. Very well made, finish is excellent, it feels new or nearly-new after a year. It's quite easy to use; this is a good length to lock frame and rear wheel to a solid object. I have always been able to do that with this chain. You might get away with a shorter one, but I like the flexibility. To carry it, I wrap it around the seat post, locking it to my rear rack in a manner that keeps it clear of my rear mudguard. I pair it with a Kryptonite New York Standard U-lock, also excellent. These locks may have a deterrent quality too, because no-one has even tried to steal my bicycle. The only drawback with this chain is that the lock mechanism is a little bit frustrating to use. The internal bolt will engage after only about a quarter turn of the key. It makes the lock fiddly and difficult to use, because you'll be trying to engage the bolt but without realising it, you've already turned the key far enough to have closed the bolt too early. It must happen to me nearly every day. If you had to turn the key further, like one full rotation, to engage the bolt, it would be a lot easier. But this is a small thing. Overall I think it's an excellent chain lock and also good value for such a great lock.

Works well; it's robust; does not get clogged with mud/water (given the proper use of the cover); and its length is perfect for hooking both the bike frame and the front wheel to a lamp/bike rack. If you're undecided between the short and long (90cm) locks, choose the long one. I have had no regrets, given that a shorter one would have been a nightmare to lock onto normal street fixtures.

If you want a sturdy bike chain, this is it. The chain is sturdy, feels like it’d be extremely hard to get to. Where it falls short however is the key mechanism - if you’re someone whose used to hopping on and off your bike pretty quickly, this lock is going to get on your nerves. It’s very heavy so does slow you down a bit sometimes, but mostly it’s heaviness gets in the way of locking it up - I’ve found it takes me a while to lock the thing up, especially if you are trying to use it in conjunction with one of kyrtoponites wire things! The keyhole also requires a bit of jiggling, and I found it gets a bit scratchy after a rainshower. There’s rubber bits near the lock... take these off, they are so annoying! All in all, it’s built like a tank, but adds a bit of annoyance when locking up.

Damn, this thing is heavy, which speaks to the difficulty you’d have trying to cut through it. Been happy to leave my bike locked up with this monster wrapped around it. Great item.

I wanted to park my new bike in a not very secure area (local shopping centre. Allenton, Derby), and wanted another lock that would at the very least, prove a challenge to a determined bike thief. Now, I'm no expert but this beauty fits that bill. Granted it is heavy, but heavy in this case is good. The chain links are nice and big and chunky, and are covered in a nice cover. Lock takes a little bit of getting used to, but is easy enough to use. Has a nice weather proof cover. Three keys are provided, one with a little light, which is great. Would it stop a professional utltra determined bike thief? Probably not, but it would slow them down a lot (hopefull). Haven't had my bike nicked yet anyway (This maybe because the bike is a cheap as chips model, though:)

Very good lock for your bicycle

Good product, delivered quickly

Nobody's gonna get my ebike now with this monster locking it up! This thing is HEAVY but the lock is smooth and fast to open and close. I registered it to get the $3,000 insurance that is available through Kryptonite.

Arrivata non proprio in tempissimo. Sembra di ottima fattura ed é sicuramente una ottima protezione se lasciata in luoghi frequentati. Se dobbiamo essere pignoli la descrizione (anche sul sito del produttore) riporta tre chiavi di cui una a led ma in realtà non ho trovato questo. Forse avrei preso la versione da 120cm perché da 90 mi sembra un po’ corta per la mia moto

Heavy and safe lock, I'm using it as an additional lock for my motorbike, it's good and intimidating for anyone with bad intentions.

Feels like a good lock with how heavy it is. Easy to use