Abstract: A bicycle lock apparatus comprises a locking mechanism selectively changeable between locked and unlocked configurations and an elongated securing arm. The securing arm includes a first end adapted for removable insertion into the locking mechanism it is unlocked, and for non-removable connection when it is locked. The securing arm further includes an armored sheath extending a length of at least seven feet and having an annular wall formed from at least two spirally-wound metallic strips interwound with one another to define a continuous interior cavity. The armored sheath is flexibly obedient to be reconfigurable into curved positions and holds the positions after the bending force is removed. The securing arm further includes a reinforcing core disposed within the interior cavity, the reinforcing core including at least one bundle of elongated non-metallic fiber material having a tensile strength-to-weight ratio of at least 1000 kN·m/Kg extending between the first and second ends.