Which bike lock should I choose?
I have recently been in a neighborhood watch training. Bike theft was one of the topic.

They showed us a footage where they asked a skilled thief to break various locks, from low end dental floss (10 Euro worth) to high end sturdy looking one (60 Euro). The thief was able to take rid of all of them in a matter of about 30 seconds, with few difference between flimsy and sturdy ones.

Bottom line: the only way to safely lock your bike is make it an hassle to remove all the locks with respect to the other available targets.


Use redundant locks (they will require more time to be removed)
Lock your bike where other similar bikes are available (thieves go for the low hanging fruit, unless you park a carbon frame 5000 Euro bike among steel 100 Euro bikes)
Make it hard for the thief to be unnoticed while working around your locks (don't lock your bike in a dark and out of sight alley)