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

4.5 4.5 out of 5 stars 792 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Bike U-Locks by Onguard

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Purchase options and add-ons

Brand Onguard
Lock Type U-lock
Item Dimensions LxWxH 2.01 x 4.61 x 8.35 inches
Material Steel

About this item

  • 9" shackle combined with 4' braided steel cable let's you lock bike to standard parking meter post without removing front wheel
  • Shackle Dimensions: 115mm x 230mm (W x H x Diam) (4.5" x 9") x 13mm (0.51") D Cable Dimensions: 120cm x 10mm (4' x 0.39")
  • Security Rating 65,Technology: X2P

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Product Description

Product Description

Product Description Bull Dog STD double-teamed with fully coated 4' braided steel cable for extra locking options. Shackle Dimensions 115mm x 230mm W x H x Diam 4.53'' x 9.06'' x 13mm 0.51'' D Cable Dimensions 120cm x 10mm 4' x 0.39'' From the Manufacturer NEW extra thick molded end caps protect against bumps and hits. 10mm fully coated braided steel cable allows for extra locking versatility.

From the Manufacturer

NEW extra thick molded end caps protect against bumps and hits. 10mm fully coated braided steel cable allows for extra locking versatility.

Product information

Technical Details

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OnGuard

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


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Customer reviews

4.5 out of 5 stars
4.5 out of 5
792 global ratings

Customers say

Customers like the quality, sturdiness, performance, and key selection of the lock. For example, they mention it looks intimidating, works well, and comes with extra keys. Opinions are mixed on length and size.

AI-generated from the text of customer reviews

98 customers mention75 positive23 negative

Customers like the quality of the lock. They mention it's a great lock that has never been finnicky, it has the cable to be able to lock up the entire bike, and the locking mechanism is smooth and easy to lock and unlock. Some say that the lock works fine and is well made. Overall, most are satisfied with the quality and functionality of the product.

"Pretty heavty lock" Read more

"...The lock is heavy and secure, the keys are easy to use, and I've had no trouble with snow and ice damaging the lock/key mechanism like other,..." Read more

"Great quality lock for the price. After doing A LOT of research I basically decided that at the end of the day, all locks are deterrents...." Read more

"...does not impress and will not be used, but the lock lays nicely on the rear rack, secured by velcro straps...." Read more

55 customers mention47 positive8 negative

Customers like the sturdiness of the lock. They say it's strong, beefy, and made of thick steel. Some say it lasts even in a tropical climate outdoors.

"...The lock is heavy and secure, the keys are easy to use, and I've had no trouble with snow and ice damaging the lock/key mechanism like other,..." Read more

"...While not the most secure of its kind, it appears solid and well built...." Read more

"...Either are rugged and heavy-duty. I recommend this bike lock." Read more

"I really like this lock. It feels really beefy and is big enough to get around my bike frame and the bike rack...." Read more

28 customers mention23 positive5 negative

Customers like the performance of the lock. They say it works well, does exactly what it needs to, and protects their bike. Some mention that the mount works well and the cable is thick. Overall, most are satisfied with the performance and functionality of the product.

"...The mount works very well and the cable is quite thick. So thick in fact that i have trouble fishing the cable into my saddle...." Read more

"This lock works great, and (so far) protects my bike even when locked up outside my building for hours all day or even overnight...." Read more

"...It is heavy-duty and functions as its intended to. Only issue is the lighted key never lit up. :..." Read more

"...Having had it for two years I can say this product works well. No one has tried to steal my bike as I lock it correctly and it has all bolt on parts...." Read more

18 customers mention14 positive4 negative

Customers like the key selection of the lock. They say it comes with extra keys and a whole bunch of spare keys. Some customers also appreciate the nifty key with the built-in light. Overall, customers are happy with the key options and functionality of the product.

"...Overall a good buy and works well to protect my ebike. Comes with extra keys." Read more

"...I own two of them and I think this is the one that comes with the nifty key with the built-in light.The only complaint...." Read more

"...You can use one or both at the same time. It comes with five keys, which you register on-line and, if you somehow lose all five (?),..." Read more

"...Lastly, they come with 5 keys which are unique looking and probably difficult for thieves to copy." Read more

8 customers mention3 positive5 negative

Customers are mixed about the length of the lock. Some like that the cable is fairly long and the loops in the chain look plenty long enough. They also say that the lengthy cable can work great to secure the bike to a pole with the u lock. However, some customers feel that the lock could be a few inches longer.

"I feel like the cable won't be long enough for everyone...." Read more

"...I especially like that the cable is fairly long and that the loops in the cable are big enough where one loop can pass through the other, making it..." Read more

"so far, so good. I just wish the cord was longer so i could wrap it around my back tire too." Read more

"This is a great lock. The cable could be a few inches longer and the mounting bracket for your bike frame is a joke, but the lock itself works..." Read more

6 customers mention3 positive3 negative

Customers are mixed about the size of the lock. Some mention that it feels really beefy and is big enough to get around their bike frame and the bike rack, while others say that it's too big to hook onto their bike frames and makes it inconvenient to transport.

"I really like this lock. It feels really beefy and is big enough to get around my bike frame and the bike rack...." Read more

"...Also, its so thick, it will not easily mount to the bike frame...." Read more

"...seems pretty big and beefy, so nice and secure and fits fairly easily over my thick frame.UPDATE: about 4 months after purchase...." Read more

"...The cable is thinner than expected and the loop is smaller.Watch the size carefully before purchasing, to check if it fits your needs!" Read more

Great lock, two small issues.
4 Stars
Great lock, two small issues.
I really like this lock. It feels really beefy and is big enough to get around my bike frame and the bike rack. Also, like the cable so I can loop through my wheel. When I first got the lock, it seemed to big to mount anywhere on my bike, so I was kind of bummed, but then I read the instructions, and saw that it could be mounted on the seat stem. I was skeptical at first, thinking it would interfere with my pedaling, but after I installed it, I didn't even notice it. So that's a plus! I've only had two issues.(1) Sometimes it's difficult to get the base locked onto the 'U'. I did lube the lock with white lithium lube so I know its not jamming as the key turns easily. So I'll live with it.(2) The lock clip that attached to the my bike came unscrewed when I was mountain biking. I know it was tightened when I installed, but I guess all the bouncing down the mountain caused the screw to back out and the lock to fall off. I have since reattached and put some loc-tite on the threads. Hopefully this will hold.
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Top reviews from other countries

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AZAZ Rafaa
5.0 out of 5 stars Très bien
Reviewed in France on November 11, 2023
Gnomo Lothbrok
5.0 out of 5 stars Excelente producto!!!!!
Reviewed in Mexico on November 20, 2020
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Gnomo Lothbrok
5.0 out of 5 stars Excelente producto!!!!!
Reviewed in Mexico on November 20, 2020
este candado es muy útil , es muy resistente tan solo al tacto ya que se siente de buena calidad , aunque mi bici no es de un alto costo , no me gustaría que algún abusivo se la lleve ya que me es muy útil para ir al trabajo , el cable que trae no lo usare ya que es muy delgado y un poco corto 1 metro aproximadamente , en el empaque encontré 4 llaves de repuesto y 1 con luz , también trae una abrazadera para poderlo colocar en el cuadro, es un poco pesado como 1kg , pero vale la pena el esfuerzo de traerlo ademas viene evaluado en seguridad silver 70 puntos de 100 .
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Donatella
5.0 out of 5 stars Mi da l’idea di essere robusto.
Reviewed in Italy on October 3, 2021
Gjolaj Florjan
5.0 out of 5 stars Heavy duty lock for great price
Reviewed in Canada on March 13, 2019
One person found this helpful
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Al Cappuccino
5.0 out of 5 stars Cheap, light and tough
Reviewed in Germany on February 23, 2019
One person found this helpful
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