Description
The OnGuard RockSolid U-Lock is engineered for riders who demand advanced protection against modern theft tools. Built with a 14 mm (0.55 in) TriRadius hardened steel shackle and a proprietary angle-grinder-resistant coating, this lock helps resist cutting wheels, saws, and leverage attacks used by determined thieves. The X4P Quad Lock mechanism secures the shackle on four sides to prevent spreading, twisting, or forced separation under attack. Its balanced 90 mm 175 mm (3.55 in 6.90 in) interior dimensions provide secure locking around racks and posts while minimizing leverage space. Despite its extreme strength, the lock remains portable for daily commuting and high-risk urban environments.