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Bike alarm buying guide

Updated: 20.10.2026

You are looking at amazon.co.uk listings that all claim 110 dB or 113 dB, and that number does not say whether the unit straps to a frame or pins a brake disc. This bike alarm buying guide orders the type of device, how it is powered and mounted, what this shelf costs, and why a siren still needs a lock. The twelve listings and their GBP prices are on the [bike alarm comparison](/hub/burglar-protection/bike-alarm). Figures run from £11.99 to £28.98. There is no lab loudness test. A qualifying purchase through our links can earn a commission at no extra cost to you.

You are looking at amazon.co.uk listings that all claim 110 dB or 113 dB, and that number does not say whether the unit straps to a frame or pins a brake disc.

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 you are actually buying
  2. 2.The criteria that change the purchase
  3. 3.Price bands on this shelf
  4. 4.The lock and the paperwork

What you are actually buying

Three objects share the words “bike alarm” here. A vibration remote straps to the frame and arms from a fob. It does not stop a wheel, and a tape-only mount can be pocketed. An alarm disc lock, the REAPP PC1406 at £28.98, passes a pin through a brake disc and then screams. A rim-brake bike cannot use it. A tracker, or a system that stops the engine starting, is a third purchase. None of the twelve ASINs reports a location, and none is a Thatcham motorcycle alarm. If you wanted the bike found after it has gone, buy that other class of product. This guide is for a noise-maker you can hear from the kitchen or the shop door. Merseyside Police still start with two locks and a BikeRegister mark.

The criteria that change the purchase

Mounting decides whether the siren is still there. A Fosmon reviewer says to use tape and cable ties together, because a light stick-down pulls off. The USB-C Cruxer adds a nylon bracket a reviewer twisted off when it was not screwed down. The fit steps are on how to fit a bike alarm. Seven levels, left high, trigger from a jet wash, a broom, rain, or a lifted cover. IP55, IP65, and IP66 are splash claims. Power splits the shelf: three AAA cells on the Cruxer 22R at £13.99, USB-C on the KS-SF32R at £19.99 and the Tawveml at £20.99, and LR44 cells in the REAPP. The Cruxer 22R prints both 20 m and 50 m. The Mengshen says 15 m. A 4.6 from three Getsuna ratings is weaker evidence than the Wsdcam’s 4.5 from 17,273.
Wsdcam Wsdcam 113 dB remote alarm

Testsieger

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

Price bands on this shelf

Entry on this set is about £12 to £15. Mid shelf runs from the Wsdcam at £16.99 to the Tawveml at £20.99. The REAPP is £28.98, and that price does not buy a Sold Secure test such as the Oxford Boss Powered Cycle Gold listing. Named picks are on the best bike alarm page.

The lock and the paperwork

A siren has no pedal-cycle grade, however large the decibel claim. Bikmo’s 2024 note records Sold Secure Gold on some claims that insurer looked at. That is one book of business, not every policy. If your schedule names a grade, buy a lock that carries it and keep the siren as the part you can hear. Register the frame with BikeRegister. The REAPP behaves like a loud secondary lock, and the file does not say Sold Secure. The strap-on or pin choice is bike alarm vs disc lock. E-bike and scooter limits are on the e-bike alarm page.

Common questions

Is a louder decibel number a better alarm?
Not on this shelf. Listings cluster at 110 dB or 113 dB, and neither figure was measured here. Reviewers call the Wsdcam, Mengshen, Fosmon, and Cruxer units loud in use. A 113 dB line does not fix a mount that twists off, a remote that never pairs, or a missing lock. Choose type and power first. Treat the decibel line as a claim the neighbours will also hear.
Do I still need a D-lock or a chain?
Yes, if the bike can be ridden or carried away. A vibration remote only makes a noise. Merseyside Police point at two locks, and Sold Secure grades those locks rather than the siren. Reviewers of the REAPP still describe it as a layer beside another lock. If your insurer named a grade, the lock has to meet it. The siren does not tick that box.
Should I choose AAA, AA, or USB-C?
Choose AAA or AA if you want cells from a shop and accept that they die. The Cruxer 22R takes three AAA cells at £13.99. A NineLeaf reviewer reported about 50 to 60 days on three AA cells. Choose USB-C on the Cruxer KS-SF32R or the Tawveml if you would rather charge. The REAPP uses LR44 cells, which reviewers say run down quickly.
What does an IP65 claim change?
It is a splash rating, not a promise of silent rain. IP65 is on the Fosmon, the USB-C Cruxer, the Tawveml, and as a highlight on the NineLeaf. IP55 is on the Wsdcam, Mengshen, Cruxer 22R, and Qumox. IP66 is printed on the flashing Cruxer, which has 27 ratings. A Wsdcam unit still false-alarmed in rain under a car bumper. Turn sensitivity down. Do not treat the IP code as a lock.
Will this satisfy my cycle insurance?
Only if the policy does not require a named lock grade. Bikmo’s 2024 note records Sold Secure Gold as a reason some claims were declined. Your schedule may say something else, including where the bike is kept. A 113 dB puck does not replace that wording. Mark the frame, lock to the grade you were told to use, and treat the alarm as the call you can answer while you are still in earshot.

Related pages

Bike alarm

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

E-bike alarm: siren for a shove, not GPS or a lock

How to fit a bike alarm before the first night outside

Bike alarm vs disc lock: noise, or a pin in the disc

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)