SIGTUNAFolding Bike Lock - Hardened Steel 8mm Fold-Up Heavy Duty Bike Lock with Easy Mounting, Secure Lock and Anti-Scratch Coating - Easily Keep Bike Secure and Paintwork Undamaged - Bicycle Lock

I've had this for a couple years now and it's excellent. Hasn't broken, still works, extremely easy to use, stores on the frame. It's long enough for most situations, and it feels very secure.

This is a very cleverly portable yet robust design that I would feel confident in protecting my property from theft to at least a moderate degree. There are multiple, small, lightweight devices available that are similar in form but offer no real security except perhaps to possibly deter a passerby thief who spontaneously decides to ride off with your beautiful bike. Some, costing quite a bit more than this product, can be easily cut off in seconds and offer about the same security as tying a good piece of string around your bike. Granted, nothing will 100% protect against a determined thief who is out to get your expensive set of wheels and has tools, know-how and time, but this lock will greatly tilt the odds of their success in your favor, and would send most off in search of an easier target. The design and quality of materials used on this lock is superb making the current pricing on it a bargain! It cannot be cut with casual cutters, and the type of lock employed (abloy) cannot be picked.But...(the conundrum)This package weighs appx a couple of pounds. Online it looks like it would be much lighter. Much of the expense on a precious bike to be protected was to shave a few extra grams off of the bike's weight. Having attached a lock that adds a couple of extra pounds, let alone ounces, might not be a welcomed idea to many. The owner of a very expensive, very lightweight bike might use a heftier lock like this to add security when storing in their garage, but would probably not want to carry it around at all times, as this is designed to mount on the bike. However, this may be very suitable for mounting to a heavier bike such as a tandem or an E-bike or for the casual rider with a nice hybrid.I've been jammering on...sorry...In sum, this is a great lock for anyone except the most devoted race-bike enthusiast who would never leave their bike unattended in the first place!

I originally purchased another lock foldylock forever which I found heavy at coming in at close to 5lbs which was to heavy for my track bike so I returned it and got this sigtuna lock at more than half the weight, and way cheaper too! I love how light and secure this sigtuna lock is while still maintaining it's stronghold. The only thing I'm not the biggest fan of with this lock is the key! They entryway door which blocks out the elements gets stuck sometimes and it would of been nice if it was a Lazer cut key instead of just a regular key. I love that it comes with its own holster which fits perfectly on the water bracket screws on my bike. Definitely a solid lock for the price! I live in Chicago so mainly lock up for 3 hours tops until I'm in my next adventure! However if I was doing over night or multiple days of being locked up I would definitely get a stronger lock.

I was looking for something a little lighter than a U-lock, but almost as strong. This is it. And bonus: it allows more flexibility in lock-ups. The holster works great, except for one small disappointment. The velcro straps for the holster have a very nice rubber contact side for your bike frame so the holster stays in place, but the velcro is only on one small part of the strap so they only work with a regular size tube. I had hoped to attach it to the underside of my down tube, but my down tube is a little bigger and while the straps are certainly long enough to wrap around the tube, the velcro does not extend to the end of the straps and does not work for a wider tube. I don't understand why they didn't include more velcro so it would work on wider tubes or why they include these longer straps with no functional reason to be that long. Maybe I got a defective holster without the velcro that should have been along the end of the straps. But it just means I have to attach the holster to my seat tube instead. No biggie.

I have the lock from Lectric brand and this one. It's obvious that lectric rebranded this one. Works great and I love this lock but if you wanna save some money buy this. Adds no weight to your bike and stays secure. Easy to install and is a great value for the lock!

I've had this lock for a few years now. The first time somebody tries to steal my $3,000+ E-bike, they're successful.... Apparently a bar was used. As you can see it broke at the edge of the rivet. I have a police report and a case number and I'm waiting for the FLPD to pull the video evidence as the bike was parked near a police substation with cameras when it was stolen. Very disheartening! I really believed this lock would take some time for somebody to get through. In less than 30 seconds it was gone. The bike was only left for a few minutes (10) out of sight... In my opinion it didn't work as described. One star review.