Best E Bike Lock With Alarm: 9 Options Compared

#1 · Best Overall

1. eMjollRay Bike Chain Lock

• dimensions: 5 x 1.97 x 0.98 in
• Weight: 1.55 kg
• Material: Alloy Steel

Best for: Remote-Operated Chain Security.

Why it ranks #1: Pairs an alloy-steel, 4-foot chain with a 110dB alarm, remote operation, USB-C charging, and three keys for a practical lock-and-alarm package.

A vibration-triggered 110dB siren pairs with remote locking and unlocking, letting riders arm the alarm without handling the lock at the bike. The 8mm alloy-steel chain is listed at four feet long, giving this eMjollRay option a physical tether as well as an audible deterrent.

The 110dB vibration alarm can alert people nearby when the locked bike is disturbed, while remote operation makes arming and disarming more convenient at a rack. Its four-foot, 8mm alloy-steel chain provides a flexible tether for bicycles, e-scooters, or motorcycles, though the available reach depends on the parking anchor. USB-C charging for the lock and remotes avoids relying solely on disposable batteries, and three included keys provide another access method.

Skip it if you need a U-lock opening for a fat-tire wheel; ENZZONE Alarm U Lock 011 specifies a 5-by-6-inch shackle opening.

Choose this for a bicycle or e-scooter owner who wants an alarmed chain and remote operation in one lock. Its four-foot length is the key fit boundary, so check the distance to your regular locking point.

Listed on Amazon as: Bike Chain Lock with Alarm E Scooter Lock Anti-Theft Alarm 110dB 8MM 4ft Security Heavy Duty with USB C Cable and 3 Keys for Bike/E Scooter/Motorcycle

#2 · Best for Fat-Tire E-Bikes

2. ENZZONE 16mm Alarm U Lock

• dimensions: 7 x 1.5 x 9 in
• Weight: 1.77 g
• Material: Metal

Best for: Fat-Tire E-Bike U-Lock.

Why it ranks #2: Its listing specifically targets fat-tire e-bikes and gives a 5-by-6-inch shackle opening plus a 16mm hardened stainless steel bar.

A 5-by-6-inch shackle opening is specified for fat-tire e-bikes with 20-by-4-inch wheels, giving this ENZZONE alarm U-lock a fit target beyond ordinary narrow-wheel setups. Its motion sensor sounds an alarm when tampering is detected, combining a rigid locking format with an audible warning.

The 16mm hardened stainless-steel bar provides the U-lock structure, while the built-in motion sensor adds an audible response to tampering. The stated 5-inch width and 6-inch height of the opening help buyers assess whether the lock can pass around their wheel and chosen anchor. An on/off switch lets riders activate or deactivate the alarm function, and the listing names scooters and motorcycles as additional intended uses.

Skip it if you want a flexible 37-inch chain and waterproof storage bag; FODAHRWS SF32R+03C offers both.

This suits riders of specified 20-by-4-inch fat-tire e-bikes who prefer a rigid U-lock with an alarm. The fixed shackle dimensions remain the practical boundary, especially when the locking point is bulky or awkwardly placed.

Listed on Amazon as: Heavy Duty Anti Theft Alarm U Lock for E-Bikes, Scooters, Motorcycles – 16mm Stainless Steel, 3 Keys, Weatherproof

#3 · Most Adjustable Alarm Volume

3. FODAHRWS 37-Inch Alarm Chain

• dimensions: 11.8 x 6.08 x 5.1 in
• Material: Silicone, Stainless Steel

Best for: Volume-Tunable Scooter Chain.

Why it ranks #3: The 37-inch chain includes a motion-sensitive alarm with seven volume levels, remote operation, and a waterproof storage bag.

Seven adjustable alarm volume levels let riders set the FODAHRWS chain lock's motion-triggered warning to suit different surroundings. A remote can arm or disarm it from a distance, and the 37-inch chain provides reach for securing e-scooters, bicycles, or motorcycles to a suitable anchor.

The 37-inch chain is listed for scooters, bicycles, and motorcycles, offering more wrapping flexibility than a fixed shackle when the anchor is offset. Its motion-sensitive alarm can be set across seven volume levels, which helps adapt the warning to the parking environment. Remote arming and disarming reduces the need to operate the alarm at the lock itself. A waterproof storage bag supports carrying and storage, and the description says the heavy-duty alloy-steel chain resists cutting and sawing.

Skip it if you need a rigid shackle around a fat-tire wheel; ENZZONE Alarm U Lock 011 lists a 5-by-6-inch opening.

Consider this for scooter and bike riders wanting a remotely operated chain alarm with adjustable volume and a storage bag. The 37-inch reach is the main fit boundary for unusual or distant anchor points.

Listed on Amazon as: Electric Scooter Locks Anti Theft with Alarm, Waterproof Scooter Bag and Key, Heavy Duty Anti-Theft Bike Chain Lock Security for E-Scooters, Bicycle, Motorcycle Accessories, 37 in

#4 · Best Resetting Alarm

4. ENZZONE Red Alarm U-Lock

• dimensions: 7 x 1.5 x 9 in
• Weight: 1.6 oz
• Material: Metal

Best for: Alarmed Fat-Tire U-Lock.

Why it ranks #4: This alarm U-lock has an on/off switch and a stated 10-second reset before motion can trigger the alarm again.

A 5-by-6-inch shackle opening is specified for fat-tire e-bikes with 20-by-4-inch wheels, while a built-in motion sensor adds an alarm when tampering is detected. This red ENZZONE U-lock combines a rigid format with an alarm that resets after ten seconds and sounds again if movement continues.

The 5/8-inch hardened-steel U-lock is intended for security, and its stated opening dimensions help riders evaluate clearance around a fat-tire wheel and anchor. The motion alarm adds an audible warning when the lock is disturbed; after sounding, it resets after ten seconds and can trigger again if movement resumes. An on/off switch allows the alarm to be activated or deactivated. The listing also names scooters and motorcycles among its intended uses.

Skip it if you want remote arming and a flexible chain; FODAHRWS SF32R+03C lists remote operation and a 37-inch chain.

This is a fit for riders seeking an alarmed hardened-steel U-lock, particularly around the listed fat-tire wheel size. Its fixed opening matters: assess the wheel-and-anchor route before choosing this rigid format.

Listed on Amazon as: Alarm U-Lock for E-Bikes, 5/8" Hardened Steel, Motion Alarm, Red

#5

5. Mengshen Remote Alarm Lock

• dimensions: 1.97 x 4.33 x 9.45 in
• Material: Plastic

Best for: Keyless Alarm Cable Lock.

Why it ranks #5: Offers a stated 115dB alarm, remote or four-digit password operation, and IP55 protection; the listing describes a cable lock.

Remote control or a four-digit password can lock and unlock this Mengshen cable without keys, giving riders two access methods for everyday stops. Its vibration alarm reaches 115dB and can also trigger if someone tries to cut or disassemble the lock, adding alerts beyond simple movement detection.

The remote works at up to 40 meters, while the four-digit password offers an alternative when carrying or using the remote is inconvenient. With up to 256 password combinations, riders can choose a personal code rather than depend on keys. The alarm responds to movement or vibration and is also described as triggering during attempted cutting or disassembly. IP55 protection supports outdoor cycling use, though the listed material is plastic, a relevant construction consideration for buyers.

Skip it if you require a listed hardened-steel shackle; ENZZONE Alarm U Lock 007 specifies a 5/8-inch hardened-steel bar.

Choose this for a rider who values keyless access and a loud alarm in a cable-lock format. Its plastic-listed construction is an important boundary for buyers prioritizing a hardened metal locking structure.

Listed on Amazon as: Mengshen Bike Lock with Remote Control Anti-Theft Vibration Alarm IP55

#6 · Best Disc-Lock Format

6. YOHOOLYO Alarm Disc Lock

• Weight: 12.32 oz

Best for: Disc-Brake Parking Alarm.

Why it ranks #6: A compact-format alternative with a stated 110dB alarm, 7mm locking pin, waterproof description, and 5-foot reminder cable.

A 7mm locking pin that can be set at 360 degrees gives the YOHOOLYO alarm disc lock flexible positioning on a compatible brake disc. Its 110dB siren adds an audible deterrent, making this compact-format approach relevant to riders who want a lock attached directly at the wheel.

The disc-lock format secures at the brake disc rather than reaching around a frame and parking anchor, so it suits a parking routine where the disc is accessible. The 7mm pin's 360-degree positioning supports placement flexibility, while the 110dB alarm can call attention to movement. The listing identifies motorcycles, bicycles, and scooters as compatible device types and includes a five-foot reminder cable and carry pouch in the title, useful for carrying and remembering the lock.

Skip it if you need a chain to wrap around a remote anchor; eMjollRay TS-BJQ03 supplies a four-foot alarmed chain.

Pick this for a motorcycle, bicycle, or scooter rider whose parking setup exposes a compatible brake disc. The disc-mounted format avoids needing chain reach, but it cannot secure the vehicle to a separate anchor.

Listed on Amazon as: YOHOOLYO Alarm Disc Lock Motorcycle Disc Brake Lock Anti-Theft Waterproof 110 dB 7mm Pin 5ft Reminder Cable for Motorcycles Bike Scooter Carry Pouch (Black)

#7

7. FODAHRWS Rectangle Alarm Chain

• dimensions: 11.8 x 6.08 x 5.1 in
• Material: Stainless Steel

Best for: Remote 37-Inch Alarm Chain.

Why it ranks #7: Provides a 37-inch chain, remote control, seven alarm volume levels, and a waterproof bag, though it overlaps with another FODAHRWS listing.

A 37-inch chain pairs with a motion-sensitive alarm whose seven volume levels let riders adjust the warning to their surroundings. The FODAHRWS lock also includes remote arming and disarming and a waterproof storage bag, giving scooter and bicycle owners a portable alarmed chain setup.

The 37-inch chain is listed for e-scooters, bicycles, motorcycles, and other uses, providing flexibility to wrap around a vehicle and a suitable anchor. Its motion-sensitive alarm has seven volume levels, allowing riders to choose an alert intensity for the parking setting. Remote operation handles arming and disarming from a distance, while the waterproof bag helps contain the lock during transport. The description says the heavy-duty alloy-steel chain resists cutting and sawing; the listing also identifies stainless steel as material.

Skip it if you need an adjustable alarm sensitivity rather than volume; POWVINE Max lists seven sensitivity levels and rechargeable operation.

Choose this for scooter or bicycle parking where a 37-inch chain can reach the anchor and remote alarm controls are useful. Its chain length and the available anchor route are the main practical fit considerations.

Listed on Amazon as: Electric Scooter Lock with Alarm, 37" Anti-Theft Chain Lock, Waterproof Bag

#8

8. wsdcam Wireless Bike Alarm

• Weight: 113 g

Best for: Adjustable Wireless Bike Alarm.

Why it ranks #8: Adds a 113dB vibration alarm with seven sensitivity levels, three volume levels, IP55 protection, and remote control, but is an alarm rather than a lock.

Seven sensitivity settings and three volume levels let riders tune the wsdcam vibration alarm to their surroundings instead of relying on one fixed response. The wireless remote reaches up to 66 feet, and a vehicle-search function with three bell sounds can help locate a parked bike.

The vibration sensor's adjustable sensitivity gives riders options for different parking environments, while three volume levels let them select an alarm intensity. IP55 water resistance supports use outdoors, and remote control up to 66 feet allows operation without standing beside the bike. The search function offers three ringtones for locating a vehicle in a parking lot; the listing notes these search tones do not operate in ARM mode. A low-battery indicator signals when replacement is needed.

Skip it if you need one product that physically tethers the bike as well as alarms; Mengshen MS-Z12Black is listed as a lock cable.

This fits riders who already secure their bike separately and want adjustable vibration alerts plus remote search assistance. It does not replace a physical lock, so plan on pairing it with a separate way to secure the vehicle.

Listed on Amazon as: Wsdcam 113dB Bike Alarm Wireless Vibration Motion Sensor Waterproof Motorcycle Alarm with Remote

#9

9. POWVINE Rechargeable Bike Alarm

• dimensions: 1.78 x 1.26 x 1.78 in
• Material: Polyvinyl Chloride

Best for: Rechargeable Remote Bike Alarm.

Why it ranks #9: A portable, rechargeable alarm with a remote and seven sensitivity levels, but the supplied information describes no physical locking mechanism.

A rechargeable alarm with remote control and seven sensitivity levels gives this POWVINE unit adjustable motion monitoring without serving as a physical lock. The title lists a maximum 110dB alarm, and its compact 1.78-by-1.26-by-1.78-inch dimensions suit buyers seeking a small alarm unit.

Seven sensitivity levels let riders adjust the response to movement, while the remote supports operating the alarm without reaching the unit directly. The listed maximum output is 110dB, providing an audible warning when triggered. Rechargeable and weather-resistant are named features, reducing dependence on disposable batteries and supporting outdoor use. At 1.78 by 1.26 by 1.78 inches, the alarm has a compact footprint; the supplied information identifies it as an alarm and remote rather than a chain or U-lock.

Skip it if you need an alarm integrated with a chain; eMjollRay TS-BJQ03 combines a four-foot chain and 110dB alarm.

This suits riders who already have a physical lock and want a compact, rechargeable alarm with remote operation. Treat it as an added alert, not a substitute for securing the bike to an anchor.

Listed on Amazon as: Max 110dB Bike Alarm,Bike Alarms For Ebikes Rechargeable Motorcycle Alarm With Remote,7 Levels Sensitivity Bicycle Alarm, Anti Theft Bicycle Alarm& Ebike Alarm For Car Motorcycle Scooter Ebike