One Bike; AXA defender ring lock and chain combination, 1 key..
Other bike; Abus folding link lock,
and an Abus Chain Lock , 2 different types of locks, use either or Both..
BikeRadar does destructive testing of locks to have a report on what it takes to break them.
Last edited by fietsbob; 06-07-13 at 07:43 AM.