On Guard

Mastiff Chain Lock - Keyed, 800mm x 7mm

OnGuard Mastiff Chain Lock (Keyed) is a security-focused bicycle chain lock designed for riders who want solid theft deterrence without the bulk of oversized chains. The 800mm length provides practical reach for locking a frame and wheel to a rack, while the 7mm chain keeps packability reasonable for commuting, errands, and campus parking.

• 7mm hex-link chain - Compact, flexible layout that wraps cleanly around racks, posts, and awkward locking points
• Titanium reinforcement - Added structural reinforcement intended to improve resistance to common cutting attacks versus basic chain constructions
• Water- and heat-resistant chain cover - Helps protect frames and wheels from abrasion while also reducing noise and scuffs during transport
• Keyed lock with 5 keys included - Extra spares for multiple riders, a backup set at home, or long-term key management