OnGuard Bulldog DT

*Est. $45
May 2013
by ConsumerSearch
OnGuard Bulldog DT 5012

  • Includes supplemental cable lock
  • Comes with five keys, one with a light
  • $1,501 anti-theft warranty
  • Not the best for high-crime areas
  • No theft protection in New York
Where to Buy

Bottom line

Many reviewers caution against relying solely on a cable bike lock, but it's good for additional protection. The OnGuard Bulldog DT is a handy two-in-one option, a U-lock plus cable lock, all at a reasonable price. This lock shouldn't be your top choice if you live in a high-crime city, however.

Ease of use

Cable included. Experts say no bike lock is impenetrable, so the test of a good lock is how long it can resist an attack. Testers easily clip most cable locks in a few seconds, so they don't recommend relying on a cable lock alone. Steel U-locks get the highest scores overall, but a standard size typically fits around the bike frame, one wheel and the bike rack, leaving the other wheel and the seat unprotected.

The OnGuard Bulldog DT includes a U-lock made of hardened steel and a supplemental cable together in one package. Reviews say this added feature is a bonus, but warn that cables aren't the most secure way to keep a bike's front wheel safe.


Tough lock, faulty keys. Like other OnGuard models, the Bulldog DT is made of tough, durable hardened steel. However, numerous reviewers warn of faulty, broken keys. This major drawback makes it difficult to recommend the lock, despite its other stellar features.

Warranty & security

Not the best option. While the cable lock is a welcome addition for keeping the front wheel secure, the OnGuard Bulldog DT doesn't offer the same level of security as other top bike locks. If you have a valuable bike or ride in a high-crime area, experts recommend buying a maximum-security U-lock like the Kryptonite New York Fahgettaboudit Mini (Est. $70) for the frame and rear wheel since it's thicker and stronger, and a second U-lock for the front wheel.

The Bulldog DT features a $1,501 anti-theft warranty, but it's not available in New York State.

Where To Buy
OnGuard Bulldog DT U-Lock with 4-Inch Cinch Loop Cable (Black, 4.53 x 9.06-Inch)

 (134 reviews)

In Stock. Eligible for FREE Super Saver Shipping


Our Sources


Review Credibility: Very Good More than 100 owners review the OnGuard Bulldog DT bike lock, giving it 3.3 stars out of 5. They like the cable's usefulness but find the U-lock's locking mechanism difficult to work with. Some dislike the delicate keys. Others complain about the weight and say they wouldn't rely on the lock for leaving a bike overnight in an urban setting.

Review: OnGuard Bulldog DT 5012 Bicycle U-Lock and Extra Security Cable, Contributors to, As of May 2013


Review Credibility: Good This U.K. website reports that the OnGuard Bulldog DT U-lock took anything testers threw at it with hand tools, but ultimately succumbed to power tools. Rossiter says the addition of a cable lock to this already strong U-lock makes the Bulldog a good deal.

Review: OnGuard Bulldog DT Lock Review, Warren Rossiter, Nov. 9, 2010

3. The New York Times

Review Credibility: Fair In this review, editor of Urban Velo magazine Brad Quartuccio says the OnGuard Bulldog DT is "pretty perfect for most people." However, we can't tell if he tested the lock.

Review: Physical Culture: Gear Test, Locks, Stephen Krcmar, Aug. 2, 2007

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