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OnGuard Bulldog Mini DT U-Lock with 4-Inch Cinch Loop Cable (Black, 3.55 x 5.52-Inch)

by OnGuard
4.1 out of 5 stars 56 customer reviews
| 4 answered questions

List Price: $39.95
Price: $27.76 & FREE Shipping on orders over $35. Details
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  • U-Locks
  • BullDog Mini with 4 foot fully coated, braided steel cable for greater locking versatility.
  • New Z-Cylinder is bump-proof and resists picking, pulling or drilling.
  • Security Rating 65
  • Snap Lock Quick Release multi-position mounting bracket. 5 laser cut keys 1 micro-light and 4 extra grip keys Micro-light key projects a bright white beam.
44 new from $27.75 2 used from $23.60
$27.76 & FREE Shipping on orders over $35. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

  • OnGuard Bulldog Mini DT U-Lock with 4-Inch Cinch Loop Cable (Black, 3.55 x 5.52-Inch)
  • +
  • BV Bicycle Light Set Super Bright 5 LED Headlight, 3 LED Taillight, Quick-Release
Total price: $36.75
Buy the selected items together

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Technical Details


Product Description

BullDog Mini with 4 foot fully coated, braided steel cable for greater locking versatility. Shackle Dimensions 90mm x 140mm W x H x Diam 3.55'' x 5.52'' x 13mm 0.51'' D Cable Dimensions 120cm x 10mm4' x 0.39''

Product Details

  • Product Dimensions: 8 x 4 x 1 inches ; 2 pounds
  • Shipping Weight: 2.8 pounds (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item can be shipped to select countries outside of the U.S. Learn More
  • Origin: China
  • ASIN: B008K3NSLM
  • Item model number: 45008015
  • Average Customer Review: 4.1 out of 5 stars  See all reviews (56 customer reviews)
  • Amazon Best Sellers Rank: #77,855 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.
  • Discontinued by manufacturer: Yes

Customer Reviews

Top Customer Reviews

Verified Purchase
My previous model OnGuard broke after almost 4 years of heavy usage.
(May be earlier, since the internal parts fell apart after the yellow cap fell off)

Pros: just the right size (see the bottom of this comment)

Improvements: yellow caps are more solid, made of hard plastic

Changes: got heavier (but not much and acceptable assuming the hardened security)

Cons: yes, you have to precisely put the parts together in order to turn the key and lock it.

Here are three tricks:
1) always make sure that the key is turned completely to the "Open" position (it's a bit hard when you have it on the same chain with other keys)
2) connect the parts with the same motion and effort as some use for assembling the weapon after cleaning and lubricating (Click)
3) if the key is not turning, follow 1), pull the parts 1-2mm apart, tilt a little and press them together firmly (Clack).

google for "Sheldon Brown locking your bike" to check the best use of this lock.
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Works for the quick lock up when going inside to pick something up or grab a bite to eat but i wouldn't use overnight.
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Verified Purchase
This is my 2nd Bulldog U-Lock and I really enjoy using them. You are given 4 thin keys and one beefier key with an integrate light.

I'm using these locks for my commuting bikes.
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Verified Purchase
The lock appears well-made and locks on both ends. I'd give it 5 stars. The Protection Plan, however, I'm not as pleased with. It is touted as paying you up to $1501 if your bike is stolen while locked up. But it does not cover the cable; only the UBolt. And it does not cover if "torches, battery operated tools, or any power tools, including hydraulic tools, were used to open or cut the lock". Plus to register for the plan, you have to fill out a form and mail it with a check - the coverage isn't free - $1/1 year, $10/2 years, $15/3 years. And they may require a copy of the receipt for your bike (that part of their webpage isn't very clear).

So - buy it for the protection, not for the protection plan.
1 Comment 8 of 11 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Verified Purchase
Good quality lock, but it's so small that i have to use the cable every time. There's no clean way to carry the cable around, so be prepared to wrap it around your frame and have it bump you in the leg while you're riding.
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Verified Purchase
The mechanism to hold the lock onto the bike frame is flimsy and does not work well.

The keyhole does not accept the key well and makes it difficult to lock and unlock.
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Verified Purchase
Used this to secure road bike in the bike room of apartment complex. I know that this is difficult to pry open because we had forgotten about the key that we had to call a handyman and he had to use an electric saw to free the bike.
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Verified Purchase
I just got a new bike and had to make sure it was locked up so I could sleep at night. This lock seems like its plenty strong and comes with a cable.
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OnGuard Bulldog Mini DT U-Lock with 4-Inch Cinch Loop Cable (Black, 3.55 x 5.52-Inch)
This item: OnGuard Bulldog Mini DT U-Lock with 4-Inch Cinch Loop Cable (Black, 3.55 x 5.52-Inch)
Price: $27.76
Ships from and sold by Amazon.com
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