Mathtoxyz Motorcycle Disc Brake Lock — 110dB Alarm, 5ft Reminder Cable, Waterproof Aluminum

Mathtoxyz Motorcycle Alarm Disc Brake Lock is a compact, weather-resistant disc lock that emits a 110dB alarm and uses a 5ft reminder cable to deter theft and prevent riding off with the lock engaged.

Designed for riders who park outdoors, in shared lots or on city streets, this alarmed disc brake lock combines a loud siren with motion detection and a visible metal deterrent. Constructed from aluminum alloy and supplied with two keys, a hex key, a carry pouch and a replaceable battery, it fits most disc-rotor motorcycles, scooters, mopeds and e-bikes with rotor holes and a rotor thickness under 7mm.

How does the alarm detect tampering and warn off thieves?

The lock houses motion sensors that trigger a 110dB siren when it senses movement or impact on the wheel. Built-in algorithms reduce false triggers while ensuring a prompt alarm response when tampering is genuine.

• 110dB alarm loud enough to attract attention and startle intruders
• Shock and movement sensors monitor rotor disturbances
• Anti-false-alarm algorithms for reliable activation
• Keyed shutoff or automatic timeout to stop the alarm

How do I install and activate the disc brake lock?

Installation is straightforward: align the locking pin through a rotor hole and press the alarm button to arm. The lock beeps after a few seconds to confirm activation; unlock with one of the included keys when you’re ready to ride.

• Slide locking pin through rotor hole and press alarm button
• Lock beeps after about 5 seconds confirming activation
• Use supplied keys to immediately disable alarm and remove lock
• 30-second auto-disable option if not unlocked manually

Is this lock durable and suitable for outdoor use?

Yes — the body is machined from aluminum alloy and sealed to resist rain and grime, while the internal battery is replaceable for long service life. The finish and components are intended for regular outdoor exposure and practical daily use.

• Aluminum-alloy construction resists rust and wear
• Waterproof design tolerates rain and damp parking environments
• Replaceable battery simplifies long-term maintenance
• Compact form factor stores easily in the included pouch

Will this fit my motorcycle, scooter, or e-bike?

The Mathtoxyz disc lock fits rotors with through-holes and a thickness under about 7mm (1/4 inch). It’s compatible with many motorcycles, scooters, mopeds, mountain bikes and e-bikes, but check your rotor specifications before buying.

• Designed for rotors with holes and thickness < 7mm (1/4")
• Works on many motorcycles, scooters, mopeds and bicycles
• Not suitable for solid rotors without holes or very thick rotors
• Includes 2 keys plus hex key and 1.5m reminder cable

Who is this for: Riders who want an affordable, visible theft deterrent combined with an audible alarm — ideal for commuters, apartment dwellers, urban riders and anyone who parks outdoors. If you need a compact lock that warns you and others of tampering while fitting most drilled disc rotors, the Mathtoxyz alarm disc brake lock is a practical choice.