The OnGuard Bulldog Medium U-Lock delivers strong everyday protection in a compact size designed for urban riders and commuters. Its 13 mm hardened steel shackle helps resist cutting, prying, and leverage attacks, while the X2P Double Bolt mechanism locks both sides of the shackle for added strength and stability. The advanced Z-Cylinder core provides resistance against bumping, drilling, and picking attempts for dependable long-term performance. Protective co-molded crossbar covers and rubber coatings help protect bike frames and finishes from scratches while molded end caps absorb impacts. Designed for practical city use, the Bulldog Medium balances portability and security. Includes five laser-cut keys and a universal mounting bracket for convenient on-bike storage. Dimensions: 90 x 175 mm (3.55 x 6.90").

Mae Mae (comprador verificado) –
very strong
It works well. I attached it to my Townie and use it daily. It’s thicker than my old lock, but that’s the point. Too thin and it can be cut. This lock is long and I can weave it through my front tire, the bike rack at work, the rear tire/rear frame and slide my helmet on to it. You just have to get used to how tightly coiled it is. It is loosening up a bit daily.
Nancy Rattigan (comprador verificado) –
It’s the perfect gift for my friend who loves to shop and …
This was actually purchased for my roommate and a birthday gift. It’s the perfect gift for my friend who loves to shop and is always afraid her beach bike will be stolen. No more, problem solved!
Seth (comprador verificado) –
Lightweight and very easy to lock/unlock
Lightweight and very easy to lock/unlock. 5 keys provided so now worry about losing them. Coils very well but does make it somewhat difficult to maneuver when locking. OVerall very satisfied
Amazon Customer (comprador verificado) –
Rugged and useful
Just what it looks like it should be: Rugged and stiffly curled.The latter makes it easy to store, but a bit awkward to deploy… just as one should expect, so it isn’t a defect.Definitely a product to make a casual thief look at other bikes first.
Alex (comprador verificado) –
No fue lo que pedi.
Desafortunadamente estaba entusiasmado con esta compra sin embargo lo tuve que devolver porque me mandaron un modelo diferente al que había solicitado. Misma marca pero diferente modelo y especificaciones.
Noonan_Danny (comprador verificado) –
Not as pictured
Received a bicycle u lock rather than a coil lock.
CD (comprador verificado) –
It’s look like they don’t know what they doing
I didn’t get the right item.