A bike lock with an alarm adds an audible layer of protection when someone bumps, moves, or tampers with your bicycle, e-bike, scooter, or motorcycle. The right choice depends on more than decibel ratings: lock style, steel construction, mounting convenience, weather resistance, and alarm controls all affect everyday security.
We compared 10 alarmed locks across disc-lock, U-lock, chain, and folding designs to help you match your vehicle, parking routine, and security needs with a practical option.
Best 10 Bike Lock with Alarm Picks for 2026
Best Motorcycle Disc Lock
- 110 dB motion-triggered alarm
- 7 mm pin and weather-resistant metal body
- Includes cable, keys, batteries, and pouch
Best For: Portable security for motorcycles, scooters, and bicycles
Best Fat-Tire E-Bike U-Lock
- Motion sensor triggers an audible alarm
- 5/8-inch hardened-steel shackle
- Fits fat-tire e-bikes and includes three keys
Best For: Large e-bikes, scooters, and motorcycles
Best Alarm Chain Lock
BANGTING 4-Foot Bike Chain Lock
- 4-foot flexible chain for varied anchor points
- 8 mm manganese-steel construction
- 110 dB IP65 alarm with two remotes
Best For: Bikes, e-bikes, and outdoor gates or fences
Best Simple Alarm Disc Lock
Alarm Disc Lock with Reminder Cable
- 110 dB vibration-triggered alarm
- Weather-resistant alloy-steel construction
- Includes cable, keys, pouch, and spare batteries
Best For: Portable security for compatible disc-brake vehicles
Fat-Tire Defender
- Motion-triggered audible alarm
- Large opening for fat-tire e-bikes
- Rubber-coated, weatherproof shackle
Best For: Fat-tire e-bikes, scooters, and motorcycles
Disc-Lock Sentinel
Rechargeable 120dB Alarm Disc Lock
- 120dB vibration-triggered alarm
- USB-C rechargeable battery
- Includes reminder and helmet cables
Best For: Motorcycles, e-bikes, scooters, and disc-brake bicycles
Remote Cable Guard
Remote-Control Alarm Cable Lock
- Remote or four-digit password access
- 115dB vibration and tamper alarm
- 31-inch steel cable with IP55 protection
Best For: Keyless bicycle, scooter, and multi-user security
Maximum-Deterrence Folding Lock
UR476B Smart Alarm Folding Bike Lock
- 120dB alarm with warning alert
- Eight 6mm hardened-steel sections
- 90cm folding design with holder
Best For: Portable bike and scooter security with a loud integrated alarm
Heavy-Duty Chain Alarm Lock
- 130dB vibration-triggered alarm
- 8mm hardened-steel, 3.3ft chain
- IP66 waterproof construction
Best For: Outdoor security where flexible chain anchoring and loud alerts are priorities
Remote-Controlled Chain Lock
110dB USB-C Rechargeable Bike Alarm
- 110dB vibration-triggered siren
- Two remote controls included
- USB-C charging with up to 60-day standby
Best For: Users seeking rechargeable, remotely operated bike and scooter security
Best Motorcycle Disc Lock – YOHOOLYO Alarm Disc Lock
If you want a compact bike lock with alarm for a motorcycle, bicycle, or scooter, the YOHOOLYO disc lock combines a metal body with a 110 dB motion-triggered alarm. Its 7 mm pin, reminder cable, and carry pouch make it a practical option for outdoor parking and transport.
Best For: Motorcycle, scooter, and bicycle owners who prefer a portable disc-style alarm lock.
Pros:
- 110 dB alarm with a motion sensor and five-second delay
- Metal construction with weather-resistant and waterproof features
- Includes two keys, a 5-foot reminder cable, batteries, Allen wrench, and carry pouch
Cons:
- Disc-lock compatibility depends on having suitable holes or spokes
- Requires internal batteries and backup batteries rather than USB charging
This is a well-equipped choice when portability and a loud deterrent matter most. Check your vehicle’s disc or wheel opening before ordering.
Best Fat-Tire E-Bike U-Lock – EnzZone Alarm U-Lock
The EnzZone is a heavy-duty bike lock with alarm designed around larger bicycles and fat-tire e-bikes. Its motion sensor sounds an alert when tampering is detected, while the 5/8-inch hardened-steel shackle and rubber coating provide a sturdy, frame-friendly locking option.
Best For: Fat-tire e-bikes, scooters, and motorcycles that need a wide U-lock opening.
Pros:
- Motion alarm helps warn of tampering
- Designed for fat-tire e-bikes with a 5-inch by 6-inch shackle opening
- Weatherproof design, rubber-coated shackle, and three included keys
Cons:
- Large U-lock dimensions may not fit every frame or parking point
- Its alarm requires the included battery
Choose this model when standard U-locks are too small, especially for fat-tire e-bikes. Measure the frame and locking point carefully before purchase.
Best Alarm Chain Lock – BANGTING 4-Foot Bike Chain Lock
For flexible locking around racks, gates, and other fixed objects, the BANGTING chain is a bike lock with alarm built from 8 mm manganese steel. The 4-foot length can help secure two bikes together, while the 110 dB alarm and wireless remote controls add convenience.
Best For: Bicycle and e-bike owners who need reach and flexibility rather than a rigid lock shape.
Pros:
- 4-foot chain supports flexible attachment and can secure two bikes together
- 8 mm manganese-steel chain with a zinc-alloy lock core
- Includes a 110 dB IP65 alarm, two remotes, three keys, cover, bag, and USB-C cable
Cons:
- Chain locks are generally bulkier to carry than compact disc locks
- The alarm and remote controls add components that need charging or management
This is the most versatile pick of the group for securing bikes to varied anchor points. Its length and included accessories are useful, but confirm that the chain’s weight and reach suit your routine.
Best Simple Alarm Disc Lock – Alarm Disc Lock with Reminder Cable
This compact bike lock with alarm uses a push-button disc-lock design to activate a vibration-triggered alert of up to 110 dB. It includes a reminder cable, storage pouch, keys, and spare batteries, making it a straightforward option for compatible bicycles, scooters, motorcycles, and other vehicles.
Best For: Riders seeking a simple, portable alarm disc lock for compatible disc brakes.
Pros:
- 110 dB vibration-activated alarm
- Heavy-duty alloy-steel body with waterproof, rust-proof, and weather-resistant features
- Includes two keys, reminder cable, storage bag, Allen wrench, and spare batteries
Cons:
- Fits disc brakes up to 6 mm, so compatibility must be checked
- Battery-powered rather than rechargeable
Its one-press operation and included reminder cable make this a convenient grab-and-go deterrent. Verify the disc thickness before buying, since the stated fit is limited to compatible brakes up to 6 mm.
Fat-Tire Defender – Heavy-Duty Alarm U-Lock
If you need a bike lock with alarm for a fat-tire e-bike, this EnzZone U-lock combines a motion-triggered warning system with a 16mm stainless-steel shackle. Its larger opening is designed for 20″x4″ fat tires, scooters, and motorcycles, but measure your setup before ordering.
Best For: Fat-tire e-bike owners who want a weatherproof U-lock with built-in tamper alerts.
Pros:
- Motion sensor triggers an audible alarm when tampering is detected.
- 5″ x 6″ shackle opening is designed for larger fat-tire bikes and other vehicles.
- Rubber coating helps protect the frame from scratches.
- Includes three laser-cut keys and is sealed against rain, dust, and humidity.
Cons:
- The larger, heavy-duty design may be less convenient to carry than a compact lock.
- Its fit should be checked carefully because the opening is designed around larger setups.
This is a practical choice when alarm-based deterrence and broad frame clearance matter more than minimizing lock weight. The included spare key and weather protection add everyday convenience.
Disc-Lock Sentinel – Rechargeable 120dB Alarm Disc Lock
This bike lock with alarm is a disc-brake lock built for motorcycles, e-bikes, scooters, mopeds, and bicycles with disc brakes up to 7mm thick. It pairs a 120dB vibration alarm with a rechargeable battery, reminder cable, and helmet-lock cable.
Best For: Riders who want a compact disc lock with a loud alarm, rechargeable power, and accessory cables.
Pros:
- 120dB alarm uses vibration sensing and offers a silent mode.
- 500mAh battery charges through USB-C in about 1.5 hours and provides up to 2–3 months of standby time.
- IP67 waterproof rating supports use in rain, snow, and dust.
- Includes a 5ft reminder cable, helmet-lock cable, two keys, and charging cable.
Cons:
- Compatibility depends on having a disc brake no thicker than 7mm.
- As a disc lock, it does not provide the same frame-to-fixed-object coverage as a U-lock or cable lock.
For compatible bikes, this lock offers strong convenience: arm it with one button, recharge it instead of replacing batteries, and use the included cables for reminders or helmet security. Confirm disc dimensions before buying.
Remote Cable Guard – Remote-Control Alarm Cable Lock
The Mengshen is a flexible bike lock with alarm that combines a 31-inch steel cable with remote or password access. Its vibration and tamper alarm reaches 115dB, while IP55 weather resistance supports indoor and outdoor use.
Best For: Cyclists who prefer keyless control, flexible cable coverage, and the ability to share access with multiple remotes.
Pros:
- Locks and unlocks by remote control or four-digit password, with remote range up to 40 meters.
- 115dB alarm can respond to movement, vibration, cutting attempts, or disassembly.
- 10mm-diameter, 31-inch steel cable provides flexible coverage.
- One lock can be programmed for up to eight remotes, and IP55 protection supports outdoor use.
Cons:
- Runs on three AAA batteries, which require replacement.
- IP55 protection is useful for outdoor use but is less comprehensive than a fully waterproof rating.
- A cable lock may offer less physical resistance than a heavy-duty U-lock.
This model suits households or shared-use situations where remote access is more convenient than keys. Its cable is flexible for varied locking points, while the alarm adds deterrence beyond the lock itself.
Maximum-Deterrence Folding Lock – UR476B Smart Alarm Folding Bike Lock
If you want a compact bike lock with alarm, the UR476B combines a folding hardened-steel design with a 120dB warning system. Its 90cm length suits bicycles and electric scooters, while the included holder and installation hardware make everyday carrying more convenient.
Best For: Riders seeking a highly visible, portable folding lock with an integrated alarm for bikes or electric scooters.
Pros:
- 120dB alarm provides an audible deterrent when tampering continues.
- Eight 6mm hardened-steel sections and armored joints resist cutting, prying, and impact.
- Includes a side-loading holder, keys, mounting hardware, and protective coating.
Cons:
- At 1.3kg, it is heavier than many basic cable locks.
- The 90cm length may not suit every locking setup or large object.
The UR476B is a strong all-around choice when portability and visible alarm protection matter. Its folding format is convenient, though riders should account for the added weight of its heavy-duty construction.
Heavy-Duty Chain Alarm Lock – 130dB Mini U-Lock and Chain
This bike lock with alarm pairs a vibration-sensing mini U-lock with an 8mm hardened-steel chain. The 130dB alarm can be switched between alarm and silent modes, while the IP66 rating helps it handle wet outdoor conditions.
Best For: Bicycle, scooter, or motorcycle owners who want flexible chain anchoring plus a very loud vibration alarm.
Pros:
- 130dB alarm activates when movement is detected and supports silent mode.
- Includes an 8mm, 3.3ft hardened-steel chain for flexible attachment to rails, trees, or other fixed points.
- IP66 waterproof rating and a steel lock cylinder add outdoor practicality.
Cons:
- The listed weight is 2.8 pounds, making it less convenient for lightweight commuters.
- The alarm works best when the padlock is attached directly to the vehicle frame, wheel, or hub.
Choose this setup if you value maximum alarm volume and the flexibility of a chain. Its heavier format is better suited to riders who prioritize deterrence and anchoring options over minimal carry weight.
Remote-Controlled Chain Lock – 110dB USB-C Rechargeable Bike Alarm
For riders who prefer rechargeable hardware, this bike lock with alarm uses a vibration sensor, remote controls, and an 8mm chain. USB-C charging, up to 60 days of alarm standby time, and a protective fabric sleeve make it practical for regular bicycle, scooter, and motorcycle use.
Best For: Riders wanting remote operation and rechargeable alarm convenience in a flexible chain lock.
Pros:
- 110dB vibration-triggered siren helps deter tampering.
- Two remote controls provide convenient lock and unlock operation.
- USB-C charging, a fabric chain sleeve, silicone alarm cover, and storage bag are included.
Cons:
- At 1.55kg, it is relatively substantial for daily carrying.
- It requires periodic charging for the alarm and remotes.
- The alarm is rated at 110dB, below the 130dB output of some competing models.
This lock stands out for its remote control and rechargeable design rather than the lightest carry weight. It is a sensible fit for users who want flexible chain security without relying solely on replaceable batteries.
How We Picked the Best Bike Lock with Alarm
We focused on the features that matter during real-world parking and storage. The selection includes compact disc locks, rigid U-locks, flexible chains, and folding locks so different riders can balance portability, coverage, and resistance to tampering. We also considered advertised alarm volume, steel thickness, locking method, weather protection, power source, included keys or cables, and compatibility with bicycles, e-bikes, scooters, and motorcycles.
Alarm volume is only one part of security. A well-positioned lock that secures the frame or a fixed object is generally more useful than an extremely loud alarm attached where it can be easily bypassed.
Quick Comparison
- Disc locks: Compact and convenient for motorcycles and scooters with compatible brake rotors, but they usually cannot secure a bicycle to a rack by themselves.
- U-locks: Rigid and difficult to leverage when sized correctly; best for securing a frame and wheel to a solid anchor.
- Chain locks: Flexible and useful around larger posts or multiple bikes, though heavier to carry and dependent on the chain and lock body for strength.
- Folding locks: Easier to transport and adaptable to different parking points, but their joints and mounting hardware deserve careful inspection.
Key Buying Factors for a Bike Lock with Alarm
Lock Format and Fit
Choose a disc lock only if your brake rotor has a compatible hole and you have a way to transport it. For bicycles and e-bikes, measure the frame, wheel, and anchor together before choosing a U-lock or chain. A lock that is too short may not reach the rack; one that is excessively long can provide more leverage for attacks.
Construction and Coverage
Look for hardened or stainless steel components, a protected locking cylinder, and enough length or clearance to secure the frame rather than just a wheel. Chains offer reach, while U-locks typically reduce available attack space.
Alarm, Battery, and Controls
Motion and vibration sensors should trigger after a warning chirp or brief movement, rather than sounding constantly from normal handling. Check whether the alarm is rechargeable or uses replaceable batteries, how it is armed, and whether a remote control is included. USB-C charging can simplify maintenance, while a reminder cable helps prevent riding away with a disc lock attached.
Weather Resistance and Daily Use
Outdoor riders should prioritize sealed electronics and corrosion-resistant metal. Confirm the advertised protection rating, but still cover the lock when practical. Consider weight, carrying pouch or frame mount, key count, and whether the alarm can be used independently of the locking mechanism.
Who Should Buy Which Bike Lock with Alarm?
City bicycle and e-bike riders will generally get the best balance from an alarmed U-lock or chain that can secure the frame to a rack. Choose a chain when anchor size and flexibility matter most; choose a U-lock when minimizing weight and leverage points is the priority.
Scooter and motorcycle owners should consider a compatible alarm disc lock for compact secondary security, especially when portability is important. A heavy-duty alarm U-lock or chain is better when you need to connect the vehicle to a fixed object.
Riders who park overnight or in isolated areas should favor stronger steel, reliable weather protection, and a lock with a clear arming system. For higher-risk locations, combining an alarmed lock with a second independent lock and an anchored parking point provides more meaningful protection than relying on the alarm alone.