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Bike alarm vs disc lock

Updated: 20.10.2026

You have a disc brake, a strap-on siren in one tab and a small alarmed lock in the other, and both pages say alarm. They stop different things. A vibration remote makes a noise you can hear from nearby. An alarm disc lock pins the rotor so that wheel cannot roll, and then it makes a noise. This is that choice, using the products on the [bike alarm comparison](/hub/burglar-protection/bike-alarm). The wider buying order stays on the [bike alarm buying guide](/hub/burglar-protection/bike-alarm/sub/bike-alarm-buying-guide). There is no laboratory attack test. A qualifying purchase through our links can earn a commission at no extra cost to you.

You have a disc brake, a strap-on siren in one tab and a small alarmed lock in the other, and both pages say alarm. They stop different things. A vibration remote makes a noise you can hear from nearby.

Our top picks

Wsdcam Wsdcam 113 dB remote alarm

Best overall

Wsdcam Wsdcam 113 dB remote alarm
9.1/10about £16.99
View offer
Mengshen Mengshen 113 dB mini alarm

Best value

Mengshen Mengshen 113 dB mini alarm
8.8/10about £12.62
View offer
REAPP REAPP 110 dB alarm disc lock

Alternative

REAPP REAPP 110 dB alarm disc lock
8.4/10about £28.98
View offer
On this page
  1. 1.What each one stops
  2. 2.The alarm disc lock in this set
  3. 3.What a tested disc lock adds
  4. 4.When to use one, the other, or both

What each one stops

A strap-on alarm is a sensor and a speaker. If you are indoors and it starts, you can look outside. If you are at work, the bike can still be lifted once the puck is pulled off. The siren does not pass anything through the wheel. An alarm disc lock stops that wheel rolling. It does nothing for rim brakes, and nothing, alone, against a lift into a van. British Transport Police still want a lock, a chain to a fixed object, and a cover. If the bike has rim brakes, buy the siren only as noise beside a frame lock, and use how to fit a bike alarm for the strap and the sensitivity.

The alarm disc lock in this set

The REAPP PC1406 is the only alarm disc lock kept here. It costs £28.98, weighs 420 g, and claims 110 dB. There is no radio remote. You get two keys, LR44 cells, a two-year warranty, and a 1.5 m reminder cable. That cable stops you riding off with the pin still in the disc. It is not a tether to a ground anchor. Across 9,595 amazon.co.uk ratings it averages 4.4. Cells run down quickly, and owners call it a weak lock if it is used alone. The listing does not claim Sold Secure. Treat £28.98 as a noisy pin, not as a tested security lock. You lock it with a key, not a fob.
Wsdcam Wsdcam 113 dB remote alarm

Testsieger

Wsdcam Wsdcam 113 dB remote alarm
9.1/10about £16.99
View offer

What a tested disc lock adds

Sold Secure publishes attack ratings. The Oxford Boss alarm disc lock is listed as Powered Cycle Gold, with a module around 100 dB, and it can be locked with the alarm off. That is a tested alarmed disc lock, and it is not this £28.98 REAPP. The ABUS 8077 is a Gold motorcycle disc lock with an explicit line that the alarm is not part of the approval. You buy a Gold product when a policy names a grade. Bikmo’s 2024 note records Sold Secure Gold on some declined cycle claims. That is one insurer, not every wording. If your schedule names a grade, 9,595 REAPP ratings do not satisfy the sentence. A graded disc lock still leaves the van-lift gap. A chain to a fixed object is the layer British Transport Police describe.

When to use one, the other, or both

Buy the vibration remote when you need noise and you already have a lock. The review-depth pick is the Wsdcam at £16.99, 4.5 from 17,273 ratings. The lower spend is the Mengshen at £12.62. Who should skip each is on the best bike alarm page. The remote does not replace the D-lock. Buy the REAPP when the bike has a disc and you want a noisy pin as a second layer. Reviews call it weak alone. Use both only beside a rated lock or a chain. Use neither alone when the insurer named a grade or the bike can be lifted into a vehicle.

Common questions

When is the disc lock the right buy?
When the bike has a disc and you want that wheel unable to roll, with noise as a bonus. In this set that is the REAPP at £28.98, as a visible extra beside a stronger lock. It is the wrong buy alone, on rim brakes, or where the policy says Sold Secure Gold. The 1.5 m cable reminds you the lock is on. It does not anchor the bike.
Can I use both?
Yes. Lock the frame to a stand, and add either a strap-on siren or the REAPP on the disc. They fail differently. The siren can be pocketed if it is only taped. The disc lock stays behind if the bike is lifted. Using both does not create a Gold rating. It does give you noise and a pinned wheel together.
Does the REAPP meet Sold Secure Gold?
Not on the amazon.co.uk file. There is no Sold Secure claim on that listing. The Oxford Boss alarm disc lock is a Gold product at another price, and the ABUS 8077 note keeps the alarm outside that Gold approval. A 4.4 from 9,595 ratings is a lot of owners. It is not an attack test, and it does not copy a mark from a different model.
What if the bike has rim brakes?
You cannot fit this disc lock. The pin needs a rotor. Use a vibration remote for noise and a separate lock through the frame or to a fixed object, at the grade your insurer named if they named one. The siren half of the shelf, about £12 to £21, is the part that still applies.
Why is there a cable in the box?
On the REAPP it is a 1.5 m reminder so you notice the lock before you ride with the pin in the disc. Forgetting a disc lock damages rotors. The cable is not a security tether and it is not a remote. Strap-on alarms omit it because they do not pin the wheel.

Related pages

E-bike alarm

Bike alarm

Best bike alarm: known siren, USB-C, or a disc lock

Bike alarm buying guide: type, power, then the lock

How to fit a bike alarm before the first night outside

Sources

Public UK sources listed in the research digest. Listing prices, stars, and review counts are from the amazon.co.uk extracts for this category, checked on 19 October 2026.

  1. ONS nature of crime: bicycle theft (retrieved 20 October 2026)
  2. Quotezone: police-recorded bicycle theft in England (retrieved 20 October 2026)
  3. Sold Secure pedal-cycle lock grades (retrieved 20 October 2026)
  4. Sold Secure: ABUS 8077 disc lock (retrieved 20 October 2026)
  5. Environmental Protection Act 1990, section 79 (retrieved 20 October 2026)
  6. Road Vehicles (Construction and Use) Regulations 1986, regulation 37 (retrieved 20 October 2026)
  7. Merseyside Police: how safe is your bike? (retrieved 20 October 2026)