Anti-theft bike locks are a sad necessity. They disappear from shops, basements, and even workplaces where they're left unattended for eight hours. Using a cable lock, the most popular security method to date, makes us think our bike is safe. Nothing could be further from the truth. Of course, there's no 100% effective method to protect against theft, but fortunately, the bicycle market offers security methods that can effectively discourage or deter potential thieves.
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Cut-resistant and long enough to attach to anything (over 70 cm) are usually super-heavy chains like the OnGuard Beast, often considered the gold standard, or the more readily available Kryptonite New York Noose (75 cm for about 100 euros). Unfortunately, their weight, over 3 kg, will negate any weight gain we've gained by investing in a better frame or hardware.
The second option is a U-lock. The New York Fahgettaboudit Mini (also around €100) enjoys a good reputation in this category. It looks sleek and weighs "only" 2 kg, but the dimensions of the loop (approximately 15x8 cm) make it extremely difficult to attach to anything.
The best compromise between weight, functionality, and price seems to me to be the relatively unpopular Abus Bordo, which folds like a folding ruler (prices start at around 260 PLN). Folded, it takes up less space than a U-lock, and it extends from 75 cm to 120 cm, depending on the version. The standard 75 cm Abus Bordo with a 4-digit lock weighs 1 kg. The lightweight Abus Bordo Lite, in the 85 cm version with a digital lock, weighs only 650 g. Of course, it's less cut-resistant, but at least it looks exactly the same as the standard, truly robust and difficult-to-disarm Bordo. The Bordo Lite is a bit harder to find, but with a little effort, you can also find it in Polish online stores. In my opinion, it's great. 
All Bordo Abusas are sold in elegant rubber covers that attach to the frame (for bottle holes or with Velcro). However, over time, the clasps wear out, and the whole thing starts to rattle slightly if you carry the Bordo in a cover. However, the zipper loop on Timbuk2 bags, for example, is exactly the right size, and the rattle problem solves itself. All Bordos open and close very easily – even in the coldest temperatures. For ease of use, I prefer the versions with a digital lock rather than the key lock, especially if you frequently lock and unlock your bike. The entire operation takes only a few seconds with some practice. A friend of mine, a courier, also praised the Bordo for its added functionality – it works well as a nunchaku in emergency situations.
A bicycle cable, not necessarily...
As I've already mentioned, the most popular security device is a cable lock, available in various price ranges. However, all models have one thing in common: they are completely ineffective at protecting your bike, as cutting it takes only a few to a dozen seconds. Another type of lock available on the market is a cable lock equipped with so-called "sleeves" (metal sleeves threaded onto a steel cable). Manufacturers claim that this version protects your bike more effectively than the previously described cable. However, in practice, thieves often find this type of lock easily.U-lock
A U-lock is a type of security device that, by its very appearance, can deter thieves – a U-shaped steel shackle. It's inserted through the frame and attached to a selected element in the spot where you want to leave your bike. Recommended U-locks can be purchased for around 100 PLN. The most important thing is that the steel from which the lock is made is properly hardened and that the shackle has a diameter of at least 12 millimeters.
The good old chain
Another highly recommended way to secure your bike is with chains. They perform almost as well as U-locks. A sturdy chain can also be purchased for around 100 PLN, with the manufacturer guaranteeing high-quality steel. The flexibility of the chain allows you to lock your bike in unusual locations. The only downside (though not always) can be its weight (typically between 2 and 4 kg).
Other ideas
Folding locks, on the other hand, are an interesting idea compared to other solutions. This type of lock features foldable panels that are connected by rivets. Their flexibility is comparable to a chain, allowing you to lock your bike anywhere. When folded, the lock takes up very little space and weighs less than 2 kg. Unfortunately, despite these advantages, there's a risk of thieves cutting the rivets, although this type of lock is certainly less reliable than cables. A rear wheel lock can also be an additional security measure for your bike. I don't recommend using it as your only means of securing your bike, but it's a great addition to your existing security system. The lock covers both the rim and tire, preventing you from riding the bike. Bike locks are an obvious accessory, so I suggest considering them immediately after purchasing your beloved bike. Of all the locks mentioned above, I highly recommend U-locks and chains. Remember – nothing will guarantee 100% protection against theft, but there are measures you can use to effectively deter thieves. Some time ago, Krzysiek Najder wrote a piece about lightweight bicycle locks available on the market. While some of the information (prices, models) may be outdated, it's still a treasure trove of practical knowledge:Lightweight bike locks
Cut-resistant and long enough to attach to anything (over 70 cm) are usually super-heavy chains like the OnGuard Beast, often considered the gold standard, or the more readily available Kryptonite New York Noose (75 cm for about 100 euros). Unfortunately, their weight, over 3 kg, will negate any weight gain we've gained by investing in a better frame or hardware.
The second option is a U-lock. The New York Fahgettaboudit Mini (also around €100) enjoys a good reputation in this category. It looks sleek and weighs "only" 2 kg, but the dimensions of the loop (approximately 15x8 cm) make it extremely difficult to attach to anything.
The best compromise between weight, functionality, and price seems to me to be the relatively unpopular Abus Bordo, which folds like a folding ruler (prices start at around 260 PLN). Folded, it takes up less space than a U-lock, and it extends from 75 cm to 120 cm, depending on the version. The standard 75 cm Abus Bordo with a 4-digit lock weighs 1 kg. The lightweight Abus Bordo Lite, in the 85 cm version with a digital lock, weighs only 650 g. Of course, it's less cut-resistant, but at least it looks exactly the same as the standard, truly robust and difficult-to-disarm Bordo. The Bordo Lite is a bit harder to find, but with a little effort, you can also find it in Polish online stores. In my opinion, it's great.
All Bordo Abusas are sold in elegant rubber covers that attach to the frame (for bottle holes or with Velcro). However, over time, the clasps wear out, and the whole thing starts to rattle slightly if you carry the Bordo in a cover. However, the zipper loop on Timbuk2 bags, for example, is exactly the right size, and the rattle problem solves itself. All Bordos open and close very easily – even in the coldest temperatures. For ease of use, I prefer the versions with a digital lock rather than the key lock, especially if you frequently lock and unlock your bike. The entire operation takes only a few seconds with some practice. A friend of mine, a courier, also praised the Bordo for its added functionality – it works well as a nunchaku in emergency situations.
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