Abus Pro Tectic 4960 Frame Lock

Doesn’t fit all bikes. It did, however, fit mine spot on! It makes for a good lock if you are in and out quickly, but I would supplement it with another lock in less secure areas. A little on the heavy side, but all locks are. Good construction. Easy to install.

I have had this lock and others like it for decades and love it for deterring ride-off theft. Last year I bought the chain accessory for this, which turns out to be trivially easy to break. The chain is reasonably heavy, but the connection between the "finger" that inserts into the lock and the chain is super easy to break. Here is a picture of the problem after I ransomed my bike back. Stolen midday in very public bike rack.

This lock is mostly aimed at e-bikes, but can be used on other bikes as well. I would not use this as my primary lock, unless you're in a safe area, on short errands briefly away from the bike. But as a second lock, paired with say, a Kryptonite New York lock, it would serve as an outstanding second level of protection deterring even most professional thieves. The reason being one would need to make several cuts with an angle grinder (using more than one battery, and blade) to get both locks off, or use more than one tool. This is also placed at a very awkward area for an angle grinder, even a high end hydraulic bolt cutter, to cut. It can be smashed with force, but this requires more tools and technique on top of cutting. This all means getting both locks off your ... MoreThis lock is mostly aimed at e-bikes, but can be used on other bikes as well. I would not use this as my primary lock, unless you're in a safe area, on short errands briefly away from the bike. But as a second lock, paired with say, a Kryptonite New York lock, it would serve as an outstanding second level of protection deterring even most professional thieves. The reason being one would need to make several cuts with an angle grinder (using more than one battery, and blade) to get both locks off, or use more than one tool. This is also placed at a very awkward area for an angle grinder, even a high end hydraulic bolt cutter, to cut. It can be smashed with force, but this requires more tools and technique on top of cutting. This all means getting both locks off your bike would be time consuming, laborious, and a pain in the rear for almost all thieves.This lock is also a wheel lock. Meaning a thief can't ride off with your bike. But it doesn't lock to anything, so one could carry it away in a car for example, then take all the time they need at home getting it off. But it keeps people from stealing your wheels easily. Hence, the need for a second high quality lock.I would also add to not rely on the cable lock with this bike as a second lock. Cable locks are some of the easiest locks to cut with almost any bolt cutters.Understand, NO lock is completely safe. Any and all locks can either be cut free by brute force and specialized cutters/grinders, or picked by a professional, given enough time and determination. Using two quality locks means even an experienced thief is more likely to give your bike a pass, and head down the street to the next bike.