If you leave your bike outside of a grocery or other store do not expect to find it when you come out. It takes less than seconds to cut through any bike lock or chain or cable with a cordless cut-off tool and at less than $200 they are a cheap investment for a bike thief that will pay for itself with the first bike they steal. Even if the bike is insured you will still be without a bike until you can buy and receive a replacement.
If you do have to leave a bike unattended then best to have it as far from a parking lot as possible and use multiple chains and also rotor brake locks so the thief cannot grab it and toss it into the back of a pickup truck and leave with it.
I love the approach taken in Costa Rica where you leave your car or bike outside of a market or restaurant and there is an unofficial security person. I give the guy a couple dollars when I am leaving and he is happy and my car or bike is intact. I would happily give some parking attendant $10 to be sure my car or bike was protected while I was buying something or having a meal but we do not take this approach in the U.S. and instead the lot owners only post signs stating that they are not responsible for loss or damage to your vehicle while you are parked there.
If you do have to leave a bike unattended then best to have it as far from a parking lot as possible and use multiple chains and also rotor brake locks so the thief cannot grab it and toss it into the back of a pickup truck and leave with it.
I love the approach taken in Costa Rica where you leave your car or bike outside of a market or restaurant and there is an unofficial security person. I give the guy a couple dollars when I am leaving and he is happy and my car or bike is intact. I would happily give some parking attendant $10 to be sure my car or bike was protected while I was buying something or having a meal but we do not take this approach in the U.S. and instead the lot owners only post signs stating that they are not responsible for loss or damage to your vehicle while you are parked there.