A U-lock is a rigid metal ring in the shape of the letter U. The U part of the lock attaches to a crossbar section, and for this reason they are also called D-locks. To lock the bicycle, one locks it physically to some other objec… See more

Test standards that rate the effective security of bicycle locks are provided by various companies and organizations, depending on location.
In the UK, a lock certified by Sold Secure or Thatcham i… See more

Bicycle locks are only effective when they are used on secure objects. For example, a bicycle lock is useless when connected to a "sucker pole", which is a pole that gives the biker the appearance of security. A bicycle thief may ta… See more