The 5 Best Bike Locks: U-Locks, Chain Locks, and Tips (2021)
Whatever lock you go for, make sure you can get around around your lock-up point-a bike rack, a secure fence-and through the triangular side of your bike frame, and through the speakers on your rear wheel. The photo above shows this method.
Using two locks regularly is the surest way to lock your bike, with one lock inserted at the lock-up point via the rear wheel and the rear triangle, and a second lock. securing the wheel in front of your lock-up point. However, some people prefer to buy and carry two locks wherever they ride. However, both of your wheels need to be picked up at the lock-up point. It’s common for thieves to steal an unsecured front wheel, especially if the wheel has a quick -release hub that speeds up flying. That’s why I like the Kryptonite Evolution Mini-7, a decent secure U-lock with an extra cable that you can slip around the edge of your front wheel.
Keep your U-lock off the ground if it gets locked on your bike. Thieves want to take a bottle opener, which is often used for jacking up a car, and put it inside the U. With enough bombing, the jack can break the lock. If you get the U-lock off the ground, they will have a hard time making it. You also want to get a U-lock with as little more space inside the U as possible. The less space there is, the less hassle for thieves to control the tools needed to cut it.
Finally, check your lock-up area before you decide to park there. The thieves were known to have removed the poles and signed the poles off the ground and then put them back in the hole. All they have to do is wait for you to lock your bike and leave, after which they remove the pole from the hole to free your bike — no tools or noise needed.
Also check the bike racks, especially if you can find tape wrapped around them. Bicycle thieves were known to be spotted through racks and then wrapped the cut section in tape to hide their work. If bike owners walk away from a locked bike, the thief can remove the tape, cut the broken bike to slip your lock, and on its way.