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Two of the locks tested secure the bicycle with a thin coiled cable, whilst four models use metal-reinforced straps based on the principle of a lockable cable tie. All the models tested feature a combination lock. In practice, however, there are clear differences: some combination dials are precise and easy to operate, whilst others require almost watchmaker’s precision.
There are also differences when it comes to pack size. Whilst the compact locks fit easily into a jersey pocket or small saddle bag, the cables and straps are not always just as easy to stow away. For road cyclists who count every gram and every cubic centimetre, this is an important consideration.
The thin coiled cable is flexible and can easily be wrapped round a bike rack, a banister or a table leg. The plastic sheathing protects the paintwork from scratches. However, a cable generally offers less resistance to forceful attacks than a stronger metal cable.
Strap locks appear more compact and, whilst operating on the same security principle, are often more difficult to pick. However, their rigid design can make them tricky to fasten. In our test, we therefore assessed not only their resistance to tampering, but also their ease of use in everyday life. A lock that’s fiddly to open and close quickly loses its appeal during a quick stop at a café.
The Zefal K-Traz Zip 3 XL is almost identical in design to the Abus Combiflex. Its slightly lower weight is due to the narrower cable, which nevertheless proved to be durable in testing. The combination lock is easy to use and the number dials are easily accessible.
However, the slide lock is a little difficult to access. This makes it less user-friendly, particularly when you need to lock it quickly and easily. The Zefal is therefore best suited as a lightweight and practical deterrent against a casual thief trying to snatch your bike. Anyone leaving their road bike unattended in a busy area should nevertheless remain within sight.
Price: 24.95 euros >> Available here at a reduced price
Weight/Length: 99 grams / 70 centimetres
Safety: 3 out of 5 stars
Handling: 3 out of 5 stars

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