Seatylock FoldyLock Classic Folding Bike Lock - Patented High Security Sold Secure Silver Bicycle Lock - Heavy Duty Anti Theft Secure Guard with Keys & Case Mount - 37.4"

I live in a pretty safe town, so with this thing I don't worry about my bike at all. I keep it mounted on my frame, and it's so easy/fast to tie the bike up. The build quality is solid and heavy. In hindsight, I regret not buying the Foldylock Elite, which is the same lock, just longer. The frame on my bike is quite robust, and when there's not always a bike rack to lock up to, the extra length of the Elite would be helpful. I think I would have exchanged it for the longer one and paid the difference, but after only a couple uses, the coating on this lock was pretty easily scratched up (nothing that would affect functionality though).

Going on year three with this foldilock. Read about it first, decided it was the right balance of security for me.Really love the key lock which is a little different and less likely to be picked. Fits so easily on bike, folds compact into it's holder, hard to tell it's even there, I get comments on how cool it is. Make sure to check that the holder is tight enough every now and then. I once hit a pothole and the whole damn thing flew off. Not a big deal that one time, but depending on what you're doing if it gets loose on you and you take lots of big shakes it could be a thing.It is noticeably heavy but manageable. I carry my bike just the same even with it mounted. Can wrap around wide items for locking. Pay attention to tips online on how to use it safely and decrease opportunities for people to compromise it. A popular tester on YouTube put it through a lot and it performed quite well.

I bought this for my son and his electric scooter. This model was a bit heavier and bigger than I imagined, but for short term security, it's great. It enables him to run into a store for a minute or two. And I like this better than a U-lock because its flexibility allows it to be wrapped around objects of different sizes. It's not cheap, but I'm happy with it.

I recently bought a very expensive e-bike, and wanted a heavy duty lock to protect it when I stop. I didn't want a chain or cable based lock, as I didn't want to have it sitting in a bag on the bike, or banging/sliding around making noise and damaging the paint.Pros:- It folds up neatly, and slides securely into the holder which is easily mounted to the bike frame. It does not rattle, bounce, or make noise of any kind while riding. The mount is very stable. I love the clean look.- The sections of the lock are coated and won't easily damage the paint on the bike.- While no bike lock is entirely theft proof, this one is designed to be very resistant to cutting and wedging (nut splitter) attacks. I feel that this is a reasonable deterrent to quick-hit thieves when you stop for short periods along a ride. It is commonly rated as the strongest folding lock.Cons:- This lock is heavy. At almost 4 pounds, if you are looking for a light-weight lock, this is probably not for you. But as noted above, the weight is a result of the beefy components that are intended to make it stronger and more resistant to portable cutting tools.- The sections of the lock (and the overall length) are the longest I could find, but this could potentially limit the flexibility of what you can lock to. I looked for overall length to help ensure that I would be able to lock my bike to a wider array of bike racks and permanent structures, but the length of the arms can sometimes result in some awkward angles when attaching to things that effectively shorten it's overall useful length. This shouldn't necessarily be a deal breaker, but be aware that this isn't long enough to mount through/around some racks or structures like trees, etc. I can lock my front wheel to my frame on my Aventon Level 2 (barely,) so I can at least do that if I have to, but if you need more flexibility, and security isn't as big a concern, a heavy cable or chain lock might be an option.- Similarly, the bulk of this lock can (at least in the case of my bike) make it awkward to to get the lock out of the mount. (The only place I could reasonably mount mine to the frame of the Level 2 made for a pretty snug and finicky fit when trying to remove the lock from the mount.) I don't mind as I am not often locking and unlocking the bike, just be sure to consider your specific frame when purchasing this lock.- This lock is expensive. At over $100, this is a substantial investment. Considering the cost of replacing a new e-bike, it's worth it to me, but this is a consideration.- The joints can be a bit stiff. They will occasionally bind which requires a little force get them moving again. Not sure why this is, and it isn't a big deal, but I have noticed it.- Super minor nitpick, but I don't like the gold/brass colored plate around the lock keyway. I wish they made a version with a matte black powder coated finish. I did a sloppy/quick paint job with some black gloss spray paint I had around, but I would really like to have seen a black plated version.Overall, I am happy with this super heavy duty lock, and would buy it again.

Seems to be well built and strong.Folds easily.

Loved this, definitely makes me feel safe seeing how good the reviews are and seeing how difficult it is to saw through. It being so easy to carry around on the bike makes life so much easier.

Never seen a lock like this before. Great item,,, thanks

Looks and feels like a quality lock, but it's just adds too much weight to my road bike. 4.25lbs doesnt sound like a lot, but add a couple bottles of water and small saddle bag, and it changes the dynamic of the ride. I think would be perfect for heavier bikes or motorcycles.