The 5 Best Bike Locks with Alarms of 2026
Alarmed bike locks solve the oldest problem in bike security: a great lock is silent, and a thief with time and tools is patient. I compared twenty alarmed locks, U-locks, chain locks, disc locks, and add-on alarms, to find the five worth your money: the best all-around U-lock, a budget alarm that straps onto anything, a pocketable disc lock, a smart-alarm upgrade for expensive bikes, and a chain lock for awkward parking spots. The EnzZone alarm U-lock takes the top spot because it pairs real 16mm hardened steel with a motion-sensor alarm at a fair price. Here is how each pick earns its place.
| Product | Alarm Effectiveness | Physical Security | Portability | Value | |
|---|---|---|---|---|---|
 Best Budget Add-On AlarmWsdcam 113dB Bike Alarm with Remote | 8.0 | 4.0 | 9.0 | 9.5 | See PriceAmazon |
 Best Chain Lock for Locking Up AnywhereHeavy Duty Chain Lock with 110dB Alarm | 8.0 | 7.5 | 6.0 | 8.5 | See PriceAmazon |
 Best OverallEnzZone Heavy Duty Alarm U-Lock | 8.5 | 9.0 | 6.5 | 8.0 | See PriceAmazon |
 Best Portable Disc LockONVIAN Rechargeable Disc Lock 120dB | 8.5 | 7.5 | 9.5 | 9.0 | See PriceAmazon |
 Best Premium Smart AlarmURBAN UR6B Smart Alarm Disc Lock | 9.5 | 8.0 | 9.0 | 7.0 | See PriceAmazon |
Wsdcam 113dB Bike Alarm with Remote
Best for
You already own a decent lock and want an alarm layer without buying a whole new lock. This little unit straps to the bike and screams when it feels vibration. Riders on a tight budget, or anyone protecting a second bike, get the most here.
Why we love it
Eighteen thousand ratings at 4.5 stars is hard to argue with, and the value is obvious at under twenty dollars. Seven sensitivity levels and three volume levels mean you can tune it so a passing truck does not set it off, while the 66-foot remote range lets you arm it from across a parking lot. I also like the vehicle-finder chime for locating your bike in a crowded rack, something none of the other picks offer. It is an add-on and not a lock, so pair it with real steel, but as a deterrent layer it punches far above its price.
Verdict
Yes as a cheap second layer on any bike you already lock up. If you need the alarm built into an actual lock rather than strapped alongside one, step up to Best Portable Disc Lock for a real disc lock at a still-small price.
Heavy Duty Chain Lock with 110dB Alarm
Best for
You lock to street signs, railings, and bike racks where a U-lock or disc lock cannot reach. The 4-foot chain threads through the frame and around anything fixed, and the 110dB alarm covers the noise side of the equation.
Why we love it
Reach is the whole point here. Four feet of 8mm chain wraps around posts that the EnzZone U-lock simply cannot, which is the difference between locking your bike and locking your bike to something. The remote arms and disarms the 110dB alarm from a distance, and the Type-C rechargeable design means no battery hunting. Three keys in the box is generous at this price. With 576 ratings it is the most proven chain-plus-alarm option I found, and it is the pick I would hand to a city commuter who locks to whatever is available.
Pros
- 4 ft reach around fixed objects
- 110dB alarm with remote control
- USB-C rechargeable battery
- 8mm hardened chain links
Cons
- Heavier and bulkier to carry than a U-lock
- The chain links are noisy in a bag
- The alarm module is the weak point next to the chain itself
Verdict
Yes if your parking spots demand flexibility, since no U-lock reaches around a fat signpost. If you always lock to proper racks, Best Overall gives you more steel for the money.
EnzZone Heavy Duty Alarm U-Lock
Best for
You ride an e-bike or commuter and park it outside stores, offices, or transit stops. The 16mm hardened steel shackle handles the physical side while the motion sensor shouts at anyone who touches it. If you currently use a plain U-lock and worry that it is silent, this is the upgrade that makes sense.
Why we love it
The pairing is what sells it. A 16mm hardened steel shackle resists bolt cutters far better than the cable locks most alarmed options use, and the motion sensor fires an audible alarm the moment someone tampers with it. I like that it fits fat-tire e-bikes with 20 by 4 inch wheels, which the ONVIAN disc lock cannot do since it needs a disc brake rotor. The rubber-coated shackle protects your frame paint, the sealed body shrugs off rain, and three laser-cut keys mean a lost key is not a crisis. At 3.2 pounds it is not light, but that weight is the steel doing its job.
Pros
- 16mm hardened steel shackle
- Motion-sensor alarm
- Fits 20 by 4 inch fat tires
- 3 laser-cut keys included
Cons
- 3.2 lb is heavy for a backpack
- No remote; the alarm arms via an on/off switch
- A U-lock cannot reach around wide posts like a chain can
Verdict
Yes if you want one lock that covers both deterrence and resistance. If you need to lock to fixed posts the U shape cannot reach, look at Best Chain Lock for Locking Up Anywhere instead.
ONVIAN Rechargeable Disc Lock 120dB
Best for
You ride a bike, e-bike, or scooter with disc brakes and you hate hauling a heavy U-lock. This fits in a jacket pocket and clamps the brake rotor, with a 120dB alarm for anyone who tries to roll the bike away.
Why we love it
The Type-C rechargeable 500mAh battery is the standout. A 1 to 1.5 hour charge and you never buy coin cells, unlike the Wsdcam, and the battery lasts for weeks of standby. IP67 waterproofing beats every other pick here, so a downpour is a non-event. The included 6-foot steel reminder cable is a thoughtful touch: it loops to your handlebar so you never ride off with the lock still on. At 4.6 stars across 858 ratings, it is the best-reviewed compact option in the group.
Pros
- 120dB alarm
- USB-C rechargeable, no batteries to buy
- IP67 waterproof
- 6 ft reminder cable included
Cons
- Needs disc brakes with a rotor under 7mm
- Does not secure the bike to a rack
- Smaller deterrent footprint than a full U-lock
Verdict
Yes if your bike has disc brakes and you want maximum alarm per ounce. For locking to fixed objects, pair it with Best Chain Lock for Locking Up Anywhere or choose Best Overall for a single-lock solution.
URBAN UR6B Smart Alarm Disc Lock
Best for
You own an expensive e-bike or motorcycle and you want the smartest alarm in the group from a brand that specializes in security. The warning chirp before the full siren is for riders who are tired of false alarms.
Why we love it
The smart warning function is the differentiator. A light touch triggers a warning chirp, and only a real attack fires the full 120dB siren, which means fewer embarrassing false alarms than the ONVIAN. The replaceable UR24MA alarm module extends the lock's life well beyond the battery, and the fully sealed waterproof build holds up in real weather. With 4,174 ratings at 4.6 stars and a German comparison-test win, it has the strongest track record here, and the LED alert adds visibility at night.
Pros
- Warning chirp before the full 120dB siren
- Replaceable alarm module
- Truly waterproof sealed build
- 4,174 ratings from a known security brand
Cons
- Highest price in the group
- Disc lock only; does not tether to a rack
- Heavier than basic disc locks
Verdict
Yes if your bike is worth protecting and you want the most refined alarm in the group. For a cheaper compact option, Best Portable Disc Lock gets you 120dB at roughly a third of the price.
Frequently Asked Questions
Do bike alarms actually stop theft?
An alarm does not make a lock unbreakable, but 110 to 120 decibels of unwanted attention makes a thief's job dramatically less appealing. Thieves want quiet and time, and a motion-sensor siren denies both. Pair the alarm with a hardened steel lock body and you get deterrence plus resistance, which is the combination that actually works.
Will rain set off my bike lock alarm?
Not on a decent one. Look for IP55 or better sealing, since the alarm module is the part water attacks first. False alarms usually come from sensitivity set too high, not from weather, so use the adjustable sensitivity levels to dial the lock in for where you park.
How long do rechargeable alarm lock batteries last?
A 500mAh rechargeable cell charges in about an hour over USB-C and lasts weeks on standby with occasional alarms. Add-on alarms that run on coin cells need battery swaps every few months. If you park outside daily, rechargeable is the lower-maintenance choice by a wide margin.
Can I use a disc brake lock on a regular bicycle?
Only if the bike has disc brakes with a rotor thinner than 7mm, which covers most e-bikes and many modern commuters. A disc lock clamps the brake rotor to stop the wheel rolling, so rim-brake bikes are out. It also does not tether your bike to a rack, so treat it as a roll-away preventer rather than a complete lock.
Honorable Mentions
ABUS Bordo 6000KA Alarm Folding Lock
The only folding lock with an alarm here, sounding 100dB with ABUS security level 10. At 125 dollars and only 3 ratings, it could not crack the main five, but the folding form factor mounts to a frame better than anything else.
See PriceAmazonAnweller Fingerprint Chain Lock
Keyless convenience with a fingerprint reader that unlocks in 0.2 seconds plus app control for managing prints. With only 30 ratings so far, it stays an honorable mention until it proves itself over time.
See PriceAmazonMax 110dB Rechargeable Bike Alarm
A rechargeable add-on alarm at 20.99 with 4.7 stars across 181 ratings. Nearly as good as the Wsdcam pick, just with a smaller review base behind it.
See PriceAmazon
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