Bike U Lock - Sigtuna Bike Lock Cut Resistant, Heavy Duty Anti-Theft with 4ft/1.2m Cable, Bicycle Lock Made in Cut-Resistant Special Steel with Sturdy Mounting Bracket for Bikes, Ebikes, Scooters.

I wanted to upgrade my bike lock (actually, one of my bike locks - I use two U-locks in the city) to one that was thicker and - more important - has dual locking mechanisms so that two cuts would be required to remove the lock. The Sigatuna is a bit thicker, and has the dual locking mechanism (there seems to be some controversy as to whether its really 16mm or whether that is padded by the plastic coat on the steel - I don't know the answer). I thought the reviews here were encouraging so ordered it. I've been quite happy with it for the 1 month I've had it. Its a bit heavier than my other U-lock (Krypto-Lok) but definitely not "too heavy". And I suspect its much better security. The key has been easy to turn - something that was a problem with the other Master U lock I had that this replaced. I don't use the frame mounting bracket so can't comment on that - I have a rat-trap carrier and I keep it in that secured with a bungee cord. And I actually don't use the cable - and I think its generally a bad idea because all of them are easily cut. I have found that a much more convenient and secure way is to have two U locks. So I have this as my "heavy duty" lock, and a Krypto-Lok as my secondary one (and which fits through the perforations on my helmet allowing that to be securely locked to the bike). A second U lock is so much more convenient to carry than a cumbersome cable. I have the Kryptonite lock mounted to the frame, and keep the Sigatuna lock in the rat-trap carrier. It doesn't offer theft protection insurance - but that doesn't bother me. (1) My bike isn't worth that much - less than the deductible! Well, its wort a lot to me, but not money. (2) Somehow I suspect that the fine print on all those bike lock insurance plans are smarter than most bicyclists - and I rather doubt they really ever pay.

Just what I expected good quality and good price

Perfect, very strong and resistant, excellent security

I recently moved into a new apartment building known for having some bikes stolen, so I decided to invest in a solid lock to deter thieves as much as possible. This one does the job, and then some. The cable is long enough to wrap through both wheels, and the lock is extremely thick and solid, so I have no qualms about leaving my bike locked up. Some pros and cons: PROS: -The cable and lock are both extremely sturdy -The lock is very easy to unlock, and there are even two keys so you have an extra if you misplace one. -The lock twists to hide the keyhole out of sight which is a nice feature -I really appreciate being able to store the lock and cable on my bike when I'm on the move instead of lugging it in a backpack CONS: -This isn't really a con, but more of an annoyance: the cable IS long enough to wrap through both wheels, but I had a little trouble doing this with the way my apartment's bike rack is set up. Again, that's more me than the cable itself and it really is plenty long. -I had a bit of trouble securing the storage bracket to my bike. It kept slipping down on the frame, but I was finally able to tighten it enough and haven't had an issue since. Really, five stars here and no complaints. Great lock for a great price.

I bought a 16mm Sigtuna U-Lock with 12mm steel flex cable two weeks ago, and have been using it everyday since to lock my bike whenever I am biking around my university's campus and parking on and off at different locations. So far, I've been very impressed by the sturdiness of the U-Lock. It feels robust, is definitely robust, and secures my bike. The key also slots in easy, and it is super convenient to lock and unlock after parking my bike. As far as U-Locks go, Sigtuna's 16mm one ticks all the boxes, and does what you'd like a U-Lock to do extremely well. I have no complaints. The 12mm steel flex cable is of a good length, and also does its job. On a minor note however, the U-Lock is quite heavy. I am sure weight is a necessary quality for robustness (which I would prefer not sacrificed), but it would be nice to have a lighter U-Lock. The weight adds a noticeable amount of weight to my bike when biking, and can make it painful when the U-Lock falls on my foot while in the process of unlocking the U-Lock. The velcro strap, to strap in the steel flex cable onto the bike frame, is also not particularly effective. Offering U-Lock's with greater heights on your website would also be helpful. 16mm is good enough to lock my wheel against a rail, but leaves no room for me to lock both my wheel and frame together (provides much more security) against a rail.

This lock is one of the best I've ever owned. The biggest concern I had when purchasing it was my bike frame not being compatible with the mounting bracket. That concern was quickly replaced with relief once I installed it. The bracket comes with different rubber grips to use with the bracket, depending on the frame of the bike. Once the right one is used, the installation of the bracket is a breeze. The lock itself is extremely sturdy and relatively heavy, which gives comfort to how durable it is. The cable is long enough for it to wrap around the front tire to secure both the front and back tire to the frame of the bike, making it rather difficult for thieves to get away with anything. It comes with two keys, one of the which I keep in my locker at work just in case I forget the other at home. In conclusion, while the lock carries a hefty price to boot, the security it offers is second to none compared to any bike lock I've owned before. It is of very high quality, and whole heartdly justifies the price, especially if you own a bike that can be difficult to replace. I have no negatives to give and fully recommend it to anyone who is serious about protecting their cycling equipment.

High quality lock that does what it's supposed to do. The chain is quite heavy duty and wrapped in a plastic casing to protect the bike; because of that doesn't uncoil easily so takes a bit of effort to wind it through wheels and around the bike. But it has kept my bike safe.

First of all, it looks like most of the reviews here are by people who received a free or discounted product. I bought mine at full price. Maybe that's why I'm a little more critical. # My criteria I was looking for three main features in a U-lock: 1. Double locking: both ends of the hoop lock to the base, harder to cut or pry loose. 2. Thick-gauge hoop: more work to cut through. 3. No cylinder keys: too easy to pick. For bonus points, I wanted a nice frame mount, so I don't have to carry my bag every time. # The lock The Sigtuna nails all three primary points. It is a solid piece of equipment that will definitely deter all but the most determined thief. Certainly good enough for my safe town. The one trade off is that it's *heavy*! At this price point, it's reasonable to assume that a lighter metal would be too expensive. Still, it's really heavy. The cable is thick. It's a cable, which is never particularly secure, but it helps. # The frame mount The big miss for me is the frame mount. It just doesn't work well for modern mountain bikes. Frame angles today are aggressive enough that you have to be really efficient with the space inside the triangle. The slide-on style attachment fails because you need that extra space to slide it in, rather than dropping it straight into place. I have two water bottle cages right now and assumed I might have to give up one. But when I started trying to work this mount into place, I found that I'd need to remove both. That's not going to work. The clamp also doesn't accommodate non-circular tube cross sections very well. Mine has rounded triangle tubes for the top and down tubes. It looks like I could hack it with some zip ties, but it wouldn't be very secure. The seat post tube is circular, but mounting there interferes with the front deraileur cables. That last big problem is that the lock can swing on the mount. If you don't position it so the lock hangs from the mount, gravity won't be able to keep it parallel to the frame tubes. The down tube definitely isn't an option, the seat tube looks unreliable. So it appears that Sigtuna designed for top tube mounting only. # Bottom line The U-lock is secure, the cable is good to have, the frame mount is lame. I think they could nail this in version 2.