

🔐 Lock it. Alarm it. Own the street with confidence.
This Motorcycle Alarm Disc Brake Lock combines a piercing 110dB alarm with durable, waterproof aluminum construction to protect your bike from theft. Designed to fit most disc brakes up to 7mm thick, it features smart sensors that minimize false alarms and comes with essential accessories including keys, a reminder cable, and a carry pouch—perfect for urban riders who demand reliable, high-tech security.










| ASIN | B08W1H4QXL |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #12,559 in Automotive ( See Top 100 in Automotive ) #2 in Powersports Alarms & Anti-Theft |
| Color | Black |
| Customer Reviews | 4.6 4.6 out of 5 stars (3,512) |
| Date First Available | March 5, 2021 |
| Item Package Quantity | 1 |
| Item Weight | 13.7 ounces |
| Item model number | MA-CS-B |
| Manufacturer | Mathtoxyz |
| Material | Aluminum |
| Package Dimensions | 4.17 x 3.27 x 2.64 inches |
| Part Number | MA-CS-B |
| Sound Level | 110 Decibels |
C**N
Great for disc brakes
Great product for anyone that has disc brakes on their bike or motorcycle. Not only will it slow down a thief or stop them but it also has an alarm on it to draw attention. The alarm is very loud and very annoying. The alarm is very sensitive. It gives a little warning beep and then goes completely off so doesn't just go off immediately if somebody bumps into it. It fits perfect on my electric bike. Easy to use
J**E
Works well.
Works well.
S**.
Definitely worth the price.
my 2019 Harley Davidson St. glide has a security system already but sometimes we park our bikes and some not so great places to sensitivity is good. The quality seems great easy to install. I love the color matches my bike for the price, very great value and quality I cannot complain. The lock quality seems well.
S**R
Wish it was louder, but I still like it.
I use this on my e-bike when it'll be out of my view.. Sensitivity: Really good! Almost every time I try to unlock it I set it off because it's pretty sensitive... which is good. You can't really move it at all or else it'll give you the warning. Loudness: It's loud enough for you to hear if you're within sight of your bikes on a quiet street, and loud enough so that it would scare someone off... I hope. But, if there's normal street noise, you're probably not going to hear it unless you're really close. Even when I was seated outside at a restaurant and the bikes were around the corner (maybe 75' away), I tested it and my wife couldn't hear the alarm... too much traffic noise. I use this lock as just one part of my security system on my e-bike: Disc Brake Alarm Lock, Integrated Frame Lock, Bike Cover, 10mm Chain Lock, and the Apple AirTag. I would never trust just one of the security systems above, but together I feel confident that thieves will choose someone else's bike... just as long as everyone else doesn't start using all of my security systems, too... oh no, dear god, I've said too much!
M**A
Great Extra Security for a Motorcycle
I bought this disc lock alarm for my mom, who lives in Cuba and uses a motorcycle for transportation. I wanted to add an extra layer of security, and it turned out to be a great purchase. The alarm is loud when triggered, which helps deter anyone from trying to move the bike. It feels solid and well built. The reminder cable is also very useful so you don’t forget to remove it before riding. It’s easy to install and remove with the key, and it gives peace of mind knowing there’s added protection. ✔️ Loud alarm ✔️ Sturdy material ✔️ Easy to use ✔️ Good anti-theft option Definitely worth it for added security.
A**Y
Peace Of Mind
This motorcycle alarm disc brake lock is an absolute must-have for any rider! It’s solid, heavy-duty, and gives me total peace of mind when I park my bike anywhere. The metal construction feels strong and durable, and it fits perfectly on my brake rotor without any hassle. The alarm is loud—seriously loud—which is exactly what you want to scare off anyone messing with your bike. It’s super easy to use: just lock it on, and it automatically arms itself. I’ve used it in all kinds of weather, and it’s held up perfectly. For the price and the protection, you just can’t beat it. Highly recommend this lock to every motorcycle owner who wants that extra layer of security and peace of mind!
J**A
Recommended
excellent product
M**D
Money Well Spent
Best money spent on Amazon… rode my bike 18,000 miles over 10 weeks to all four corners of the United States and this little alarm gave me peace of mind everywhere I went! Easy to use and very sensitive once activated. Can’t even get into my saddle bags without it going off once I’ve set it — which is exactly what I was looking for. 🚨💪🏻
C**E
My Personal Review – Great Motorcycle Alarm! I recently got this motorcycle alarm, and I have to say, it’s worth every penny. The build quality is solid, and it doesn’t feel cheap at all. One of my biggest concerns with alarms is false triggers, but this one is well-calibrated—it won’t go off with small bumps or wind, yet it reacts instantly when the bike is actively moved. The sound is extremely loud, which is exactly what you want to deter thieves. Installation was straightforward, and it gives me peace of mind knowing my bike is protected. If you’re looking for a reliable and effective security solution for your motorcycle, I highly recommend this alarm!
A**O
Fatto bene e funzionante, il prodotto si presenta robusto e ben fatto facile da utilizzare.
N**R
Better than expected ❤️
M**Z
Vraiment bien de bonne qualité
M**A
Finalmente un buon prodotto economico ma funzionale e comodo
Trustpilot
2 months ago
1 week ago