OnGuard makes the meanest, toughest locks in the business.

On the inside, OnGuard locks earn the highest safety ratings with double and quad-locking mechanisms, bump-resistant cylinders, and hardened steel shackles and chains. On the outside, our locks are fully-coated to protect your bicycle or powersport vehicle from scratches and to shield internal parts from the elements, while the bright color scheme sends a clear warning to thieves: don’t even try! And then there’s the extras: all-tube mounting brackets, five laser cut keys, key-code registration, comprehensive anti-theft programs, limited lifetime warranties and the best sales and customer support team in the business.

Bull Mastiff (8102)

• 10mm hardened steel shackle

• Laminated steel padlock with brass internals

• Non-marring padlock bumper protects paint and finishes

• 5 heavy-duty F-style keys