The OnGuard Bulldog DT is a standard-sized U-lock that comes with a four-foot cable and a bracket to mount onto your frame. It offers mid-range security and costs $45.
Even after being roughed up and hammered on, the OnGuard Bulldog stays its ground.
OnGuard gives the Bulldog DT U-Lock a 65 out of 100 on their security scale. Sold Secure, an independent security testing company based in the U.K., rated the Bulldog a Silver (quality products rank Bronze, Silver or Gold.) This lock performed well in our security tests. We weren't able to use bolt cutters nor use a hacksaw (we tried for several minutes, only to make a barely noticeable scratch). We had heard that some professional bike thieves can use a pry bar if it is locked loosely (the more space inside the locked U-lock, the easier it is to get leverage), but we were unsuccessful. Finally, we reverted to the angle grinder to cut through the 12mm hardened steel shackle. Comparing the Bulldog to Kryptonite's Fahgettaboudit Mini or New York Standard's top-notch security points, it is in the mid-range security. That said, it is far, far better than the cable locks we tested. It's a U-lock, after all, and a solid one at that.
Here we tried the bolt cutters on first the Onguard Bulldog and then the KryptoLok Series 2. Both U-Locks held up well.
The cable part of the Bulldog is not included in OnGuard's $1,501 bicycle protection offer, and for good reason. The cable is a valuable part of the BullDog DT's package, but it can be chopped with ease. Easier, in fact, than the braided steel of the (same diameter) Kryptonite KryptoLok Series 2 Standard U-Lock. Not that either was too difficult to get through, but a note nonetheless.
Here, you can see a cross section of this lock's included four-foot cable after it's been chopped. This cable was slightly easier to break into than the one included with the Kryptonite KryptoLok Series 2 U-lock.
Ease of Transport
The Bulldog DT comes with OnGuard's mounting bracket, which we found to be easier to use and more durable than Kryptonite's version. It carries on the side of the frame, though, instead of situating inside the main triangle of the frame, as in the ABUS Granit X-Plus 540 and Kryptonite U-locks. We preferred streamlined mounts. When trying to install the bracket, large diameter mountain bike frames were too large to accommodate installation. If you own a road bike, it will fit with ease. If you want to carry the Bulldog on your mountain bike, check with a bike shop first. It's ability to be attached to your bike frame added to our appreciation of the OnGuard design. Finding a way to transport the cable was a bit more difficult. It technically can be attached to the U-lock, then clipped onto the bike frame, but we found the cable to come loose. This was annoying and potentially dangerous, so we recommend stowing the cable in your bag while riding.
The Bulldog DT U-Lock mounts on your bike frame for convenient transport.
Ease of Use
Straightforward and simple, the Bulldog DT is easy to use. It features the same dual locking mechanisms as the New York Standard and Fahgettaboudit Mini, which means both ends of the "U" are fitted into the crossbar at the same time. Kryptonite's KryptoLok was, in our opinion, easier to use because of its "bent foot" design and was awarded accordingly. The five keys provided are also a plus.
We applaud the decision to buy a U-lock with a cable to secure both wheels and your frame. Perhaps the cable will even fit around your saddle stays. The Bulldog is a great choice for those of us wise enough to know how much that front (or, jeez, rear) wheel would cost to replace. A quick note on the lock-up: make sure you lock the secure part of this setup (the U-lock) to an immovable object. Do not wrap the cable around the bike and post and then secure the end loops of the cable to the U-lock. This effectively makes your U-lock a fancy cable lock that can be cut easily.
Both wheels? Check. Frame to the bike rack? Check.
We recommend the Bulldog for touring, commuting, and for general everyday use. Mid-security is best for mid-level crime areas. Get a New York Series U-lock for big city overnight parking. Use this lock in rural areas or for daylight lock-ups in college towns or small cities.
OnGuard is reasonable when it comes to pricing, and the Bulldog is no exception. If you are thinking about a cable lock, we'd recommend upgrading to this U-lock (or our Best Buy award winner) so that you don't have to buy it when your cable lock gets cut.
This lock comes equipped with a four-foot cable for added versatility. In the end the Bulldog just didn't impress us quite as much as our comparable Best Buy award-winning KryptoLock Series 2.
When comparing the Bulldog to the KryptoLok Series 2, the KryptoLok is slightly better designed in most areas. These slights added up, and we ended up giving the KryptoLok our Best Buy Award, even though the Bulldog is a little less expensive. It is a solid lock that transports well.