Titanker Bike Chain Lock with Keys, 3.3 Feet Security Heavy Duty Anti-Theft Bicycle Chain Locks for Bike, Motorcycle, Bicycle, Door, Gate, Fence, Grill (6mm, 8mm, 10mm Thick Chain)

EDIT: I would still buy, It’s been over 6 months now (EDIT: about 6+ months in and the nylon chain cover has become detached from one end of the chain. It’s not a huge deal or very noticeable at all and can be glued back in easily. Highly recommend for people who don’t want to #1 overpay for a lock, 2 you’re in a large city or on campus and NEED a warranty if you’re parking in unsafe areas often Kryptonite has warranties but I don’t live in a large city and don’t park my bike on university campuses or downtown often and have faith in this chain. I would maybe bring extra locks if I did go downtown just in case for front wheel but the 12” chains are an excelllllent size for preventing thieves from snapping the lock as easily for a great price. Also I love the key feature. It works great and has a backup. Unless you come across a lock picking expert or someone with a giant saw you’re pretty safe imo. The locking mechanism is great and so simple to use. It unlocks very easily with just a twist. The lock cover is great for dirt and debris but I usually wear my lock cover easily around my shoulder or waist or sometimes my bicycle it’s not too heavy and a perfect length to lock my frame and rear tire. It’s also quite thick to deter any thieves, encased in nylon which prevents any scratching, and another deterrent (edit: one side of the nylon has detached but not the end of the world). I would definitely buy this again. It’s not too big take Carrie and not too small to not deter a criminal. It’s perfect compared to the insane price of some locks. Some of those lock costs 10-15% of my bicycle.I also recommend buying an apple AirTag hidden, cheaper combo than many kryptonite locks. 80-90% of bicycles are never recovered.

Looks and feels solid! The quality certainly seems to be there, very easy to install, fits easily around the bike frame and bike pole/rack. If taken care of, I anticipate significant rust resistance. The cloth material seems to be durable; cannot say much about color vibrancy of the cloth part, seeing as a I ordered black. Note: it is a chain, so it is a little heavy.

The bike lock is excellent and long enough for my needs. I really like the feature that allows you to hide the keyhole for extra security. The material covering the chain feels thick and durable—it hasn’t torn yet. The brand name remains visible along the chain, and the key turns smoothly without getting stuck.I also appreciate that the key cannot be removed unless the lock is fully secured, which prevents accidental unlocking.Unfortunately, the plastic part under the connector broke when I accidentally dropped it. However, this doesn’t affect the lock’s overall performance.

Bad quality lock, the locking/unlocking mechanism is not consistent. I've had the lock for around 8 months now and it's begun fully failing. It has not been working as intended for most of its use so far.Edit: The replacement lock has arrived and it works great, just as I remember the original working at first. I hope that it holds up and that the first one was a fluke. I’ll further edit this if the replacement begins to break as well.

Very strong and secure lock. Locks and unlocks easily. No complaints.

This is a quality product.

- the 10mm chain is too heavy even for e-scooter- 8mm seems suitable for college campus- Lock seems fine- Chain cover is good enough- Don't abuse it, and it may last for a while

Bought 6 of these. 4 failed (won't open with a key - hell, I can't even get the key in to the locks in of 2 of them ...). All 6 have been taken to the local scrap metal dump.With one of the 'stuck' ones it took less than 60 seconds with a battery powered angle grinder to completely cut the lock off ...Avoid these like the plague unless you either don't want to be able to ever remove them or are keen to get your ride stolen in under a minute!