The 8 Best Motorcycle Alarms
Updated by · How we research
Riders who want noise, a stronger lock or the bike back need different gear. The Urban UR10 disc lock leads 8 motorcycle alarm locks, sirens and a GPS tracker. When users buy our independently chosen editorial choices, we may earn commissions to help fund the Wiki.
An alarm scares off a casual thief but won't stop one with tools, so pair it with a solid lock or chain and hide a siren from view. Riders use them at home, at work and on trips. Alarmed disc locks pin the brake rotor, stand-alone sirens arm with a remote, and GPS trackers call your phone when the bike moves.
Editor's Notes
October 19, 2026, by Ezvid Wiki Admin:
The Urban UR10 alarmed disc lock tops a nearly all-new list. Almost nothing from the old one made it through. The Scorpio SRX-950, BlueFire Security Kit, Abus Granit Detecto X-Plus, Viper 3121V, Banvie Two-Way Anti-Hijacking and Tchipie Disc Lock are no longer available, and the Gorilla Automotive 9100, MysBiker Silver Knight and Rupse Anti-Theft have disappeared entirely. We also dropped the WSDcam Wireless. It's still sold, but the Fosmon 51087HOM does the same job with a better water rating and a lifetime warranty.
That left a gap. We couldn't find a hard-wired alarm system worth recommending right now, so the guide explains them instead. The new list leans on alarmed disc locks, plus a stand-alone siren and the Monimoto 9 tracker for riders who care more about getting the bike back than about noise.
One caveat runs through the whole page. An alarm scares off a casual thief, but it won't stop one with tools. The only independent attack test we found on a lock here, of the Urban UR6, showed exactly that.
September 16, 2020:
The one newcomer to our ranking is the Banvie Two-Way Anti-Hijacking, which has a lot of useful elements, including backlit screens on its pair of remotes that give you status updates about your bike. It also has a surprisingly good range. Ultimately, however, the system's durability kept it from cracking the top spots.
Personally, since I moved from the outskirts of LA closer to the city center, I've found one of these to be a necessity, and I opted for the Scorpio SRX-950 for the utter simplicity of its proximity arm/disarm function. I might have liked to save some coin and go with a simple disc brake lock like the Abus Granit Detecto X-Plus or the MysBiker Silver Knight, but I've got a high pair of tail pipes on a Scrambler, and custom panniers can get expensive, so I don't have any saddlebags to speak of. There are some excellent backpacks for motorcycling out there, but I don't always want to have one on me.
Keep an eye on installation complexity and battery care. If the setup keeps you from installing it, you're bike will be vulnerable until you do. And wired alarms can easily drain your battery if left on too long without running the bike, so if you have a dedicated parking spot that's safe near your home, and you only need the alarm to function when you're out and about, consider adding a trickle charger to your setup and reconnecting everything before you go out riding.
July 03, 2019:
Alarms are a great way to enhance the security of your motorcycle. They come in a variety of forms, each of which offers a different level of theft deterrence. An alarm that is incorporated into a disc lock, such as the MysBiker Silver Knight, Abus Granit Detecto X-Plus 8077, and Tchipie Disc Lock, combines physical deterrence with audible. While these are a great way to keep your motorcycle safe, some people may find having to attach a lock to the disc every time they park their bike to be a hassle. Storing it while riding could also be an issue for someone who doesn't have any saddlebags.
Another option is to go with an alarm that connects to the bike's electrical system. Some, like the Scorpio SRX-950, have the ability to remotely stop the engine to prevent hot wiring. Others, like the BlueFire Security Kit and Rupse CE21, can flash the indicators at the same time as sounding a siren to attract even more attention.
If you know that you will be out of ear shot of your alarm, but still want to be aware if someone is tampering with your bike, you may want to consider the Gorilla Automotive 9100. It comes with a pager system that works up to a half a mile away and vibrates to alert you if the alarm has been triggered. Of all the models on our list, the Scorpio SRX-950 is probably the most convenient option, as it arms itself automatically when you walk away, and disarms itself as you approach.
Special Honors
ABUS Granit Detecto X-Plus 8077 2.0 German lock maker ABUS builds the Granit Detecto X-Plus 8077 2.0 around a 13.5-millimeter bolt and a 100-decibel motion alarm. In Bennetts BikeSocial's attack tests, it held up against a drill, a pry bar, a lump hammer, a hacksaw and an angle grinder, where most alarm locks fail early. The reviewers wished the alarm were louder. It costs several times as much as a typical alarm lock and weighs about 934 grams, and we found no current U.S. listing for it, so look for it through motorcycle dealers and ABUS retailers. abus.com
Lock, Siren Or Tracker: Pick The Job First
Many riders use a lock alarm for the warning and a tracker for the recovery.
Motorcycle alarms come in four kinds, and they do different jobs. An alarmed disc lock puts a steel pin through a hole in the brake rotor so the wheel can't turn, and a motion sensor sets off a siren if someone moves the bike. A stand-alone alarm is a small siren box you stick or tie to the bike and arm with a remote. It fits anything but adds no physical security. Begin Motorcycling sorts the field the same way and adds the fourth kind, the wired alarm.
A wired alarm connects to the bike's battery and harness. Better systems can cut the ignition and page a remote when the bike is touched, and they're harder to rip off than a box on the outside. They need careful installation, often by a shop, and the well-known brands are now sold mostly through dealers.
A GPS tracker doesn't make noise at all. It calls or messages you when the bike moves and then shows where it is. In Bennetts BikeSocial's test of the Monimoto 9, alerts arrived almost at once. That matters, because the National Insurance Crime Bureau counted 44,564 motorcycles reported stolen in the U.S. in 2025 and only 41% recovered. Many riders use a lock alarm for the warning and a tracker for the recovery.
Loudness, Sensitivity And False Alarms
Aim for at least 100 decibels, the floor Begin Motorcycling suggests. The 110 to 120 decibel figures on most packages are makers' claims, not lab readings, so treat small differences as noise. Kryptonite's instruction sheet for its 6A alarm lock warns that a 120-decibel siren is loud enough to hurt unprotected ears, so arm it with the lock away from your head.
Sensitivity matters as much as volume. An alarm that goes off in the wind, or when a truck rumbles by, gets ignored by neighbors and switched off by its owner. Look for adjustable sensitivity, or a pre-alarm that chirps on the first bump and sounds the full siren only if the movement continues. In Bennetts' review of the Urban UR6, the sensor ignored wind but reacted to knocks. HiConsumption found the opposite trait in a cheap lock, which sometimes sounded as the key went in.
Check your local rules, too. Vehicle alarm limits in the U.S. are set by cities. San Mateo, California, for example, requires an alarm to stop within 15 minutes and lets police disconnect one that won't, at the owner's cost.
Fit, Strength And Living With A Disc Lock
Before you buy a disc lock, look at your brake rotor. Most alarm locks fit rotors up to about 7 millimeters thick, and the pin, usually 5.5 to 10 millimeters across, has to pass through one of the rotor's vent holes. A thicker pin is harder to cut, but it won't fit small holes on scooters and some sport bikes.
Don't expect a cheap alarm lock to stop a thief with tools. Bennetts' testers took the Urban UR6 off with a pry bar and a lump hammer in three blows, and HiConsumption judged a budget lock's pin cuttable in minutes. By contrast, the ABUS Granit Detecto X-Plus 8077 2.0 survived drilling, prying, hammering, sawing and an angle grinder. In the UK, insurers lean on Sold Secure ratings, which run Bronze, Silver, Gold and Diamond. Few alarm locks sold in the U.S. carry one, so check the listing on Sold Secure's site rather than trusting a box.
The most common way to damage a bike with a disc lock is riding off with it fitted. Sealey's disc lock instructions warn against it, and riders on forums describe bent forks and scratched wheels. Clip a reminder cable from the lock to the handlebar, and replace the battery as soon as the lock chirps that it's low.
How we researched this
We compared 23 motorcycle alarms, alarm locks and trackers, including all 10 from the previous version of this page. We read makers' specs and Kryptonite's printed instructions, three independent reviews from Bennetts BikeSocial, buying guides from HiConsumption and Begin Motorcycling, and rider forum reports, and we checked every brand for recalls with the U.S. Consumer Product Safety Commission. Only the Urban UR6, the Monimoto 9 and the ABUS 8077 2.0 had independent tests.
Sources (14)
- Bennetts BikeSocial: Artago Urban UR6 review
- Bennetts BikeSocial: ABUS Granit Detecto X-Plus 8077 2.0 review
- Bennetts BikeSocial: Monimoto 9 review
- Rider Magazine: Monimoto 9 GPS tracker review
- HiConsumption: best anti-theft motorcycle gear
- Begin Motorcycling: motorcycle alarms
- Kryptonite: KryptoLok 6A alarm disc lock instructions
- Monimoto
- Fosmon
- Sold Secure
- Sealey: disc lock instructions
- National Insurance Crime Bureau: vehicle theft report
- City of San Mateo: vehicle alarm ordinance 7.30.060
- CPSC SaferProducts
Frequently asked questions
Are motorcycle alarms worth it?
Yes, as a deterrent. A loud alarm scares off most opportunistic thieves and tells you or your neighbors that someone is at the bike. It won't stop a thief with tools or a van, so pair it with a solid chain or lock, and add a GPS tracker if recovery matters to you.
What is the loudest motorcycle alarm?
Several alarm disc locks claim 120 decibels, including the Urban UR10, the Urban UR6 and the Onvian Rechargeable Lock. Those are makers' figures, not independent measurements. Anything over about 100 decibels is loud enough to draw attention.
What is the best anti-theft device for a motorcycle?
Layers work best. An alarmed disc lock warns and slows a thief, a heavy chain to a fixed point stops the bike being lifted into a van, and a hidden GPS tracker helps get it back. No single device covers all three.
Do motorcycle alarms drain the battery?
Disc lock alarms and stand-alone sirens run on their own cells, so they don't touch the bike's battery. Wired alarms draw from the bike's battery, so a bike parked for weeks may need a battery tender.
Do I need a Sold Secure rated lock?
Sold Secure is a UK testing scheme, and UK insurers often ask for Gold. U.S. insurers rarely ask for a rating, but a rated lock has passed timed attack tests, which most unrated alarm locks haven't.
Does a GPS tracker sound an alarm?
Usually not. A tracker like the Monimoto 9 calls your phone when the bike moves, and then shows its location. It's silent, so a thief doesn't know it's there.
