European regulations define the different levels of security for locks ranging from 1 to 10:
Before buying a lock, always take into account when and where you’re going to use it and which bike you want to lock up.
The world of locks has also taken advantage of new technologies. In thebeginning it was small innovations like keys with lights to illuminate the keyhole at night, then the use of new materials (Text-lock, LITELOK...) put an end to themyth that a heavier lock equals a more secure lock. It’s now possible to have a 1.5kg lock that offers the same level of security as a 5kg chain.
In addition to having the right lock, there are also a few basic things you can do to prevent your bike being stolen: