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

heavy, solid built, its heavier than my bike but unless the thief has a huge angle grinder it isn't going anywhere

Can't say how resistant to attacks this is as no-one has attempted to steal my bike. But seems to be a good deterrent.

Really good quality!

A substantial bike lock that in itself is almost impossible to defeat with bolt croppers, saws, and leverage attacks.It is also difficult to attack with battery powered angle grinders, as it is hard to keep any part sufficiently still to prevent the chain from grabbing onto the blade.90cm size is just big enough for securing to most street furniture - (just make sure what you lock your bike to is at least as substantial/secure as the lock ;)Slight drawbacks - This one is pretty heavy (largely unavoidable and the price paid for being hard to cut thru, yet still a relatively cheap purchase), in the case of the lock I received, making sure the key was fully inserted and engaged takes a bit of a knack sometimes.Can be pretty confident with these locks, though just keep in mind the main defence here is in having particularly determined bike thieves pick easier targets to walk off with instead.

This lock is well sized for a motorbike wheel and fits in my bikes storage compartment.

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.

I received this quickly and we’ll packaged from Amazon at £60.00 which seems a fair price and weight point for a decent bike lock. Intended use is as a second lock for an ebike (I already have the small evolution D Lock) as I wanted a different “style” of security meaning a thief will need x2 types of cutter and hopefully look elsewhere. The Lock Picking Lawyers recommendation means a lot to me. I knew from package weight this thing was going to be heavy but as I was using x2 d locks before this replaces one reducing the real additional weight. First thoughts are that the actual lock is a fair bit more chunky than I thought from the pics and LPLs video which is presumably a good thing. Krypton it’s key registration service is first class but I’ve not bothered to pay for theft registration as have already insured the bike in any case. Is it impregnable? No of course not but it looks the part and I believe (hope) when I’m using x2 distinctive orange quality locks - of different types - this will prove off putting for the crims out there - we shall see.