Product Description

The OnGuard Bulldog Doubleteam U-Lock is constructed with a hardened ultra steel shackle and Dual Steel Bar locking mechanism for maximum security. It comes with 4 laser-cut keys and 1 light key.

Product Details

• Amazon Sales Rank: #2338 in Sports & Outdoors
• Brand: OnGuard
• Model: 45005012
• Dimensions: 1.70" h x 5.90" w x 11.60" l, 4.00 pounds

Features

• Bicycle U-lock with 13mm hardened steel shackle for maximum cut resistance
• X2 double-bolt locking mechanism locks to 2 sides of the bar for added strength
• M-Cylinder with BumbBlok mechanism resists drilling, picking, or pulling
• Comes with heavy-duty, extra-flexible 10mm steel cable; 5 laser-cut keys
• All-tube, quick-release, multi-position mounting bracket; anti-theft protection offer

Amazon.com Product Description
Keep your bike safe while visiting theft-heavy neighborhoods with the OnGuard Bulldog DT U-lock, which comes with an extra security cable. The Bulldog DT offers a 13mm hardened steel shackle that provides maximum cut resistance, along with an X2 double-bolt locking mechanism that locks to two sides of the bar, providing added strength and high pull resistance. The pick-, pull-, and drill-resistant M-Cylinder delivers even more protection, with a BumpBlok mechanism that renders bump keys useless. Similar to the tumbler systems found on high-end European autos, the M-Cylinder has more than 100,000 possible key combinations. These tumblers won't turn unless the key is properly inserted, protecting both the key and tumbler from damage due to misuse. The lock mechanism is also completely encased in ultra-hardened steel to resist drilling, picking, or pulling, while an integrated dust cover protects the internals from moisture and debris.

As a bonus, the Bulldog DT includes a heavy-duty, extra-flexible 10mm steel cable, letting you double your protection or lock up another bike on the same rack. Other features include an all-tube, quick-release, multi-position mounting bracket, protective coatings on the cross bar and shackle, and a tough vinyl cable cover. The Bulldog DT comes with five laser-cut keys, one of which has an LED micro-light to help you open the lock after dark. OnGuard believes so strongly in the Bulldog DT that it offers an anti-theft protection offer of $1,501 for bikes and $501 for power sport vehicles.

Customer Reviews

Beast of a U-Lock
This thing is the Kong Kong of U-Locks. The useful cable that comes with this set is excellent. I believe you would need a cutting blow torch to get through this thing (the U-lock not the cable). Thoughtful design with the dust/water protection drum that rotates to protect the entrance to the keyhole.

There is no place to mount this huge and heavy thing on my bike (full size mountain). With a water bottle cage + a small pack that hangs from my horizontal frame bar, I must carry the U-Lock in the Topeak Basket behind me. AND, it is HEAVY!

Be aware, this Theft Protection Program they tout is a bit of a scam. You must pay for this additional service. Also, you cannot register nor sign up for the Theft Protection on line. You must first print out a form(s) and mail it (them) in. The address is not on any of the forms. You must go back into the site to locate the mailing address.

The process of signing up for eventual support and FAQ information is a complicated event that required setting up an account that duplicates many of the registering steps and information you have just completed earlier.

BUT: This thing will definitely deter any thief that I can imagine. Isn't that the primary function anyway?

Strong, Safe and BIG
Yup, this is a big one! I can't imagine ANYONE being able to steal a bike (if you attach it like they tell you to with the cable) or your front wheel/tire -- and you don't have to take it off the fork to secure it!!! That's a shortcoming with a lock that DOESN'T include a cable. Even with a quick-release front wheel, it's a pain to take it off and then put it back on (straight) when you return to your bike. But if you don't have a way to carry this thing, you might decide it's too big and bulky. I've decided it's worth the trouble of lugging it around, but then I ride in the city and prefer to have a bike to ride rather than an empty front fork -- or worse -- an empty bike rack.

TERRIBLE KEY
After moving to Los Angeles, I needed to buy a second U-LOCK as bike's are a hot item to be stolen. One u-lock to lock my front wheel to the frame, and the second to lock the frame, back wheel, to a post, etc. I bought this U-LOCK not knowing the company, but it was sturdy and good feel and at a good price.

I had a HORRIBLE experience with this lock. My second time using this, the key broke off like butter while I was opening it. I have owned many U-LOCKS in the past and know how to not force the key, so I wasn't using much force at all. The key broke off inside the lock, leaving me stranded. I'll avoid my heroic details of finding my way home to then return with the 2nd key and plyers to remove the stuck key.

The key (you get two) that is made for this lock is EXTRA thin. All U-LOCK keys are thin and should never be forced, but this is a terrible design and major flaw. It's a good lock, but comes with a terrible key, so I would not suggest buying this.