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Best bike alarm: one product for each job

Updated: 20.10.2026

“Best” on this shelf usually means the highest star or the biggest decibel claim, and both fail. A 4.6 from three ratings is not the same evidence as a 4.5 from 17,273, and 113 dB is printed on units that do not lock a wheel. This page names three jobs, one product for each, and who should skip it. Every row and its GBP price is on the [bike alarm comparison](/hub/burglar-protection/bike-alarm). Counts below are the raw extracts for 19 October 2026. Live stars move. There is no lab hearing test. A qualifying purchase through our links can earn a commission at no extra cost to you.

“Best” on this shelf usually means the highest star or the biggest decibel claim, and both fail.

Our top picks

Cruxer Cruxer 110 dB USB-C alarm

Best overall

Cruxer Cruxer 110 dB USB-C alarm
8.9/10about £19.99
View offer
Wsdcam Wsdcam 113 dB remote alarm

Rank 2

Wsdcam Wsdcam 113 dB remote alarm
9.1/10about £16.99
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.Best for a commuter who wants a known siren
  2. 2.Best if you will not keep buying AAA cells
  3. 3.Best when the bike has a disc and you want a noisy lock
  4. 4.What not to treat as best

Best for a commuter who wants a known siren

The top pick for a strap-on siren, judged on review depth, is the Wsdcam SF22R at £16.99, 4.5 from 17,273 ratings. The listing says 113 dB, seven sensitivity levels, IP55, and a remote at 66 ft. The remote does nothing until it is paired, and rain set one unit off under a car bumper. Skip it if you needed a lock. It does not pin a disc. The Fosmon at £17.99 is 4.4 from 6,694 ratings, with IP65 and SOS tilt past 45 degrees. The 230 ft line is not a measured street range, and tape pulls off unless you add ties. Take the Wsdcam for the longer trail, and the Fosmon only if SOS and IP65 are why you came.

Best if you will not keep buying AAA cells

The rechargeable pick is the Cruxer KS-SF32R at £19.99. It claims 110 dB, a 700 mAh cell, USB-C charging, seven levels, IP65, and a nylon bracket. The extract is 4.6 from 1,413 ratings. Reviewers call it loud and usable on a motorbike without wiring into the bike battery. Range is printed as 70 m and as 229 ft. One reviewer twisted the bracket off because it was not screwed. Skip it if you want the 17,273-rating history, or if you will not screw the bracket down. The Tawveml at £20.99 adds a brake light on 370 ratings. Skip it if the bike already has a rear light.
Cruxer Cruxer 110 dB USB-C alarm

Testsieger

Cruxer Cruxer 110 dB USB-C alarm
8.9/10about £19.99
View offer

Best when the bike has a disc and you want a noisy lock

The only product here that holds a wheel is the REAPP PC1406 at £28.98. It is a keyed 110 dB alarm disc lock, 420 g, with LR44 cells and a 1.5 m reminder cable so you do not ride away with the pin in the rotor. There is no radio remote. The extract is 4.4 from 9,595 ratings. Reviewers call it a visual deterrent beside another lock, and weak alone. The cells fade quickly. The listing does not claim Sold Secure. Skip it on rim brakes. Skip it if an insurer named Sold Secure Gold. Sold Secure’s note on the ABUS 8077 says the alarm is not part of that Gold approval. Use the REAPP as a noisy layer on a rotor you already protect with a rated lock. The side-by-side is bike alarm vs disc lock.

What not to treat as best

The Getsuna at £11.99 is 4.6 from three ratings. Water resistance, cell type, and sensitivity steps are not stated, so it is not the best bike alarm on any criterion used here. The Mengshen at £12.62, 4.5 from 5,266 ratings, is the best value strap-on if you turn sensitivity down. It is not the top pick, because the Wsdcam trail is longer and the disarm chirp is loud. Pairing and sensitivity are on how to fit a bike alarm. An e-bike does not cancel the “not a lock” rule, which is on the e-bike alarm page.

Common questions

Which bike alarm is rechargeable?
The Cruxer KS-SF32R at £19.99 states a 700 mAh cell and USB-C charging, with 1,413 ratings. The Tawveml at £20.99 is USB-C and adds a brake light, with 370 ratings. The WANGCL is described as USB rechargeable, without a stated capacity, on 39 ratings. If you want shop-bought cells, the Cruxer 22R takes three AAA cells at £13.99.
Is the cheapest 4.6 the best?
No. The Getsuna is £11.99 and 4.6 from three ratings. That is too little use to call it best or best value. Best value here is the Mengshen at £12.62 with 5,266 ratings, if a 15 m range claim and a loud disarm chirp are acceptable. The top pick for a known strap-on siren remains the Wsdcam.
Who should skip a puck even if the stars are high?
Skip it if the insurer named a lock grade, if the wheel must be held, or if you need the bike found after it has left. Stars do not add a pin or a GPS position. A 4.7 from 39 ratings is thinner evidence than a 4.5 from thousands.
What if the bike has no disc?
Buy a vibration remote and a separate lock through the frame to a fixed object. The REAPP cannot go on a rim brake. The Wsdcam, the Mengshen, and the USB-C Cruxer are noise only. None of them replaces the lock.
Does best mean insured?
No. Best here means the closest match, inside this amazon.co.uk set, to one job: most-reviewed siren, rechargeable siren, or cheap alarm disc lock. It is not Sold Secure, a Thatcham category, or your policy. If the schedule names Gold, buy a lock that carries Gold and keep the siren only as noise you can hear from nearby.

Related pages

Bike alarm buying guide

Bike alarm

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)