OnGuard's Bulldog Combo STD will guard your bike day and night. It boasts a 13mm-wide hardened-steel shackle and OnGuard's stout X2P Double Bolt design that resists drilling, picking, bumping, and pulling for serious protection. This Bulldog sports a resettable 4-digit combination plus a mounting bracket so you can bring the lock along for every ride.

OnGuard's Bulldog Mini is always ready for a ride. This small U-lock is as strong as larger locks, yet much more compact. The 13mm-thick hardened steel and OnGuard's stout X2 double-bolt lock resist cutting, picking, pulling, bumping, and drilling. And you can carry it on your bike with the included bracket, or easily stow it in a pack, or even your pocket. This mighty mini also comes with five keys, including OnGuard's Microlight key which has a built-in light.

For tough physical security plus audible theft deterrence, OnGuard's Smart Alarm U-Lock has you well-covered. Its burly construction and loud audible alarm quickly convince a would-be thief to move right along. - Quattro Bolt Locking mechanism provides unequaled strength by locking the crossbar to the shackle on four sides - Features 14mm ultra hardened steel shackle for maximum cut resistance - Alarm U-Lock provides superior protection both as a stable lock and highly audible alarm - 120dB alarm sounds off when bike is moved or jostled - Alarm features auto on/off - Fully coated vinyl construction provides protection for finishes and delicate paint jobs - Includes multi-size/multi-position mounting bracket, (5) keys (1 with micro-light and 4 regular keys), plus OnGuard's anti-theft protection plan

OnGuard's Bulldog DT pairs a tough-as-nails U-lock with a sturdy steel cable for increased security. The 1/2-inch hardened steel resists cutting, and OnGuard's stout X2 double-bolt lock mechanism is pick, drill, bump, and pull-resistant. Plus, the included cable is 4-feet long so you can lock both wheels and the frame without any bike disassembly, making lock-up faster, easier and more secure. This great U-lock also comes with five keys, including OnGuard's Microlight key which has a built-in light.

OnGuard's Bulldog LS (Long Shackle) offers a large locking zone, plus OnGuard's high-security 13mm-thick hardened-steel construction and stout X2 double-bolt lock, which resists cutting, picking, bumping, and drilling. And with the included mounting bracket, your Bulldog can come along for every ride. This great U-lock also comes with five keys, including OnGuard's Microlight key which has a built-in light.

OnGuard's Bulldog STD boasts a 11mm-thick hardened-steel shackle and OnGuard's stout X2 double-bolt lock that resists drilling, picking, bumping, and pulling for serious protection. And thanks to the included mounting bracket you can bring the Bulldog along for every ride. This great U-lock also comes with five keys, including OnGuard's Microlight key which has a built-in light.

A keyed U-Lock that provides secure protection with an easy to carry mounting bracket. The standard in security Bontrager has partnered with ABUS to offer best-in-class bike security. The Elite keyed u-lock features a 9mm soft-touch steel shackle that resists cutting and double-bolting lock action for added anti-twist protection. Add in industry-leading corrosion protection and a double layered key cylinder and you get lasting protection with a durable, secure U-Lock. Includes on-bike mount and two keys. - 9mm temper hardened steel for secure U-Lock protection in a versatile size - Double bolting shackle provides anti-twist protection - Premium double-layered cylinder core provides added protection against picking - Soft-touch coating for a smooth look and feel that protects bike from scratching - Simple mount installs in seconds for simple, versatile on-bike storage - Industry-leading corrosion resistance - Includes U-Lock, bike mount, and 2 keys (replacement keys available) - Security rating 8

OnGuard's PitBull STD is a sturdy U-lock that defends your bicycle with 1/2-inch hardened steel and OnGuard's X4 quattro-bolt lock. And thanks to the included mounting bracket the PitBull will be along for every ride. This lock also comes with five keys plus OnGuard's Microlight key, which has a built-in light.