Fluster thieves with our pick of the best motorcycle alarms


We’ve said before that creating layers of security around your bike are key to helping prevent it from being stolen – and a motorbike alarm can be a great additional layer.

A disc lock will stop a thief from snapping the steering lock and pushing it away, either on foot or with an assist from an accomplice on another bike.

A chain and lock, particularly if secured to an immovable object, will prevent this as well as several thieves picking the bike up and loading it into a van.

Something else thieves dislike intensely is noise; they prefer to ply their trade in the dark and in silence so anything that creates a lot of noise as soon as they begin to attack a bike is a very good thing – it draws attention which is something they hate and hopefully, will make them give up and move on.

Related: Best motorbike ground anchors

There are several forms of bike alarm; ones that are fitted to the bike and wired in permanently so they cannot be immobilised, standalone alarms that are taped or fitted to the bike with a strap, others that forms part of another security device such as a padlock or disclock and the siren sounds when they are tampered with.

An alarm to create attention if the bike is tampered with is a useful addition in your armoury of security devices – just make sure you choose (and set-up) one that is stable and doesn’t suffer false alarms and you’ll be good to go.

Price: £15.96

Less than £16 seems a ludicrously low amount of money for a motorcycle alarm but the reviews at Amazon are pretty decent and it is Amazonu2019s Choice for u2018motorcycle alarmu2019 so the initial signs are good. It wires into the bikeu2019s electrical system for not only power (it also has a back-up battery) but so that if the bike is hijacked, you can kill the power as they ride away.

There are four levels of sensitivity and a 125dB siren that is controlled by two remote keyfobs. The instructions are a bit dubious so if you’re not confident you might need to get an auto electrician to install it but for that money, it has to be worth a try.



Alarm and immobiliser

DIY or pro fitting


Instructions not well translated

This D-lock from kit giant Oxford is not specifically an alarm but it does have one built-in, offering two levels of protection in one; you can use the lock on its own as a disclock or use it to secure a chain around something solid.

In either case, if the lock is tampered with, it will set off a 120dB alarm alerting passers-by to the theft and potentially scaring the thief off.


Use as padlock

Integral 120dB alarm

Offers layers of security


Bulky to carry

Price: £12.99

This alarm is a standalone item, designed to be fitted to bicycles or motorcycles or indeed, anything that may be vulnerable to theft. The main unit includes pretty much all the functionality; it is powered by three AAA batteries and has a seven-level sensitivity shock sensor that will sound the 113dB siren.

It is controlled by a remote-control keyfob that arms and disarms the alarm and can also set the alarm off as an SOS call if you fall off, for example. Reviews are good.


Simple to install

One integral unit

Broad functionality


Battery powered

Price: £19.97

This alarm is another that is connected to the bikeu2019s battery so it should not run out of its own juice u2013 itu2019s just two wires so should be an easy DIY fit for most home mechanics. It has two-stage tamper sensing, with a single chirp at the first detection to warm thieves off and if they continue, then the second triggers the full 120dB alarm.

The remote-control keyfobs have randomly generated codes so they cannot be grabbed by thieves and duplicated and the alarm itself has an energy-saving mode for when the bike is parked for some time.


Dual-stage triggering

120dB siren

Energy-saving mode


Reviews suggest still flattens battery

Like the alarmed D-lock from Oxford, this disclock from security specialist Kovix not only operates as a sturdy lock to prevent the bike from being pushed or ridden away, it also draws attention to unwanted tampering with a built-in 120dB alarm siren.

Battery life is said to be ‘long’ and the alarm function can be turned off, so it operates solely as a traditional disclock.


Physical deterrent

Use with or without alarm



Needs carrying somehow

Find more disclocks here

Price: £24.71

Designed to fit into pockets on the matching Guardian WeatherAll covers, this alarm works by being tethered to the bike and if the cover is tampered with or removed, it sets the alarmu2019s 130dB siren off. May fit other covers if they are provided with a small pocket.


Designed to work with covers

Add another level of security

Easy to fit


May not work with all covers

Datatool produces a wide range of alarms, many of which are fitted by manufacturers but this Evo version is a self-fit example, designed to be applied by the user. It connects directly to the battery and there is also a warning LED to provide a visual deterrent.

There are switchable chips for arming and disarming (not permitted in the UK) and there is also a transport mode, so the bike can be transported safely without the alarm being triggered. There is also an optional seat trigger in case thieves try to remove the seat pad to access the bike.


Easy to fit

Range of useful features

Great value


None we can think of

This basic two-wire alarm from Bike-It connects to the battery of the bike and offers a 125dB siren when triggered. Both the sensor module and the siren are backed with self-adhesive pads for fitting to the bike and will trigger on shocks to the bike.

There is a more involved version, the Pro, for an extra £10 that uses nine wires to add extra functionality, such as an ignition cut.


Simple to fit

Uses bike battery

Visual and audible deterrent


Could flatten bike battery

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