Comparison OnGuard Bulldog Combo DT #8012C vs OnGuard Bulldog Medium DT #8015M

The type of lock used in the construction. In this case, the lock refers exclusively to the locking device responsible for opening and closing.

- Stationary. This term is used for non-removable locks (attached directly to a cable, chain, etc., see "Type of lock"), but not for all, but only for those that use keys. This option is very popular due to its simplicity, convenience and reliability: a key lock of proper quality is quite difficult to open even with a specialized master key, and even if there are no tools, this becomes almost impossible. However the key that provides access to the lock (and the bike behind it) can be lost or “handed over” to an attacker in some way (for example, left unattended in an open place).

- Code. A kind of stationary (non-removable, see above) lock, opened with a digital code. A securely stored code has noticeable advantages over a conventional mechanical key. For example, it is impossible to lose it, forget it somewhere, drown it while swimming, etc.; and to give access to the lock to another person (for example, a relative), it is enough to tell him the combination, without worrying about spare keys. Nevertheless, there are certain dangers here too: the code can be spied on or overheard, besides, some users, not relying on memory, carry it with them written down on a piece of paper, which gives all the disadvantages of a conventional key. In additio...n, if there is a sufficient margin of time, the code lock can be opened by a simple enumeration of combinations. However, in fact, this is relevant primarily for inexpensive models with three-digit ciphers, because. it will take a lot of time to sort through a larger number of digits, and an attacker is unlikely to dare to do this.

- Mounted. This option is found mainly in bicycle locks with a chain (see "Type"). Padlocks are called locks, which, if desired, can be removed from the chain; technically, they can be both key and code, however, for a number of reasons, the first option is most common. Padlocks are often larger than fixed locks, but this is offset by the ability to unhook them for easy storage / transportation. Another advantage of this option is the ability to change the standard lock to another device without changing the cable / chain.

Dimensions of the shackle in a U-lock or padlock (see "Type").

In the first case, only two parameters are usually indicated — width and length (height), most often in that order, but sometimes vice versa. However, it is not difficult to determine where what size is — the length is longer, this is due to the purpose of the lock. It usually varies from 130 – 140 to 300 mm, width — from 80 to 115 – 120 mm. A larger shackle gives more options for attaching the bike (it will “get” further and be able to cover a larger object), however, the lock also turns out to be bulky and heavy. Shackle thickness for U-locks is listed separately (see below).

But in padlocks, all three sizes are usually called, including the thickness. Here, the width and length most often differ slightly, by a couple of millimetres, although there are exceptions, with an elongated bow. Anyway, this parameter is not as important for such locks as for U-locks: firstly, hinged models are miniature by definition, and secondly, the difference in size is not particularly critical for their main purpose (shackles 20x20 and 30x30 mm are the same effectively fasten the ends of the "average" cable or chain).

Own mount, designed to fix the lock on the bike "out of hours" — in the process of movement and when parking in safe places. In accordance with the name, such a mount is installed on the frame or under the saddle — depending on the type of lock: for example, a saddle mount is popular among cable models, and a segment mount will fit only on the frame. Usually, the lock is installed and removed using a quick-release latch.

Of course, the lock can be carried in a pocket, backpack, etc.; however , mounting to the frame/seatpost is often more convenient. In addition, keeping the lock on the bike is less likely to forget it when leaving.