OnGuard BullDog Series U-Lock and 4' cable - 4.5 x 9" | Keyed
Locks
OnGuard BullDog Series U-Lock and 4' cable - 4.5 x 9" · Keyed
OnGuard BullDog Series U-Lock and 4' cable - 4.5 x 9" | Keyed
The OnGuard BullDog Series U-Lock and 4' Cable gives you a complete locking solution in one package. Read the overview
At a glance
- Lock Type
- Keyed
- Mechanism
- X2P Double Bolt
- Shackle
- 13mm hardened steel
- Interior Dimensions
- 4.5 x 9 inches
3 in stock
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Overview
What Does the BullDog U-Lock and Cable Combo Offer?
The OnGuard BullDog Series U-Lock and 4' Cable gives you a complete locking solution in one package. The X2P Double Bolt lock mechanism secures both ends of the 13mm hardened steel shackle simultaneously, delivering a full circle of protection for your frame and primary wheel. The included 4-foot cable lets you loop through a second wheel or accessory without needing to carry a separate lock.
At 4.5 x 9 inches, the BullDog U-lock fits most bike frames and standard urban infrastructure with ease. The keyed format gives you the speed and simplicity of key entry on every stop. It's an especially smart setup for cyclists who want to secure both wheels with one system, making it the go-to choice for commuters and city riders who park at high-traffic racks regularly.
All the specs
MPN 8012
- Shackle
- 13mm hardened steel
- Lock Mechanism
- X2P Double Bolt
- Interior Dimensions
- 4.5 x 9 inches
- Included Cable
- 4 feet
- Lock Type
- Keyed
FAQ
Good questions
Get to know OnGuard

There's more to OnGuard than this one product. Our OnGuard page has the full OnGuard lineup we carry and more about the brand.
Visit the OnGuard page →What is the cable included with this lock used for?
The 4-foot cable is designed to loop through a second wheel or accessory, extending your locking coverage without needing a separate lock.
How does the X2P Double Bolt mechanism improve security?
It locks both ends of the shackle at the same time, creating a full circle of protection and reducing the leverage points available for cutting or prying attacks.
Is this lock setup good for commuting?
Yes. The combination of a U-lock for primary frame security and a cable for secondary wheel coverage makes this an efficient, all-in-one commuter locking setup.
Reviews
What riders say about the Lab
“Paul does a great job. He got my bike I bought from someone there in their town and had it packed and shipped to me in Austin, TX… It got here in perfect condition!”
“Fantastic store. It has everything you may want/need for cycling. Great team. Highly recommend to anyone looking for cycling related things and bike service.”
“I recently got back into biking and wanted to add some things onto my bike. They had most of what I was looking for in shop… I'm really happy to have found them.”
Questions about this one?
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