No matter what kind of lock you use, make sure it can wrap around your locking point-bicycle frame, safety fence-and pass through the triangular part of the bicycle frame, with Through the spokes of the rear wheel. The photo above shows this method.
Using two locks is always the safest way to lock the bicycle. One lock is screwed to the lock point through the rear wheel and the rear triangle, and the second lock secures the front wheel to the lock point. However, few people are willing to buy and carry two locks wherever they ride. Nonetheless, both of your wheels should be fixed at the locking point. It is common for thieves to steal an unsecured front wheel, especially if the front wheel has a quick-release hub, which makes it easier to take off. That’s why I like Kryptonite Evolution Mini-7. It is a very safe U-shaped lock with an extra cable that you can thread on the rim of the front wheel.
When locking the U-shaped lock to the bicycle, keep it away from the ground. Thieves like to take a bottle jack that is usually used to jack up cars and place it in the U. If you pump enough, the jack can open the lock. If you keep the U-shaped lock away from the ground, it will be difficult for them to do this. You also want to get a U-shaped lock that has as little extra space as possible inside the U-shaped. The less additional space, the less space the thief has to manipulate the tools needed to cut.
Finally, check your lock points before you decide to stop. As we all know, thieves will remove poles and marker posts from the ground, and then put them back into the hole. All they have to do is wait for you to lock the bike and leave, then they can lift the post from the hole to release your bike-no tools or noise required.
Please also check bike racks, especially if you see tape wrapped around them. As we all know, bicycle thieves will saw through the frame and then wrap the cut parts with tape to hide their work. When the bicycle owner leaves the locked bicycle, the thief can pull off the tape, pry the cut bicycle rack open enough to slide the lock out, and then go on the road.