AlterLock CycleGuardService



AlterLock is a bike security service for sports bikes. Keep an eye on your bike with a vibration detection alarm and smartphone notification. In the unlikely event of a theft, GPS tracking helps you find it. It's a new way to live your cycling life with peace of mind.


Alarm deters thieves

When AlterLock detects a vibration, its alarm sounds, deterring theft and tampering.


Peace of mind with smartphone notifications

When AlterLock detects a vibration, it notifies your phone, so you know to check your bike.


Advanced tracking capabilities

AlterLock uses both a GPS and WiFi sensor to calculate its location accurately.

Learn More

App Features

  • Register your bike's photo, specs, and VIN number
  • Toggle the device lock mode
  • Device settings (for various situations including vibration detection level, alarm on/off, alarm duration, first alarm sound, number of alarms, regular transmission, etc.)
  • Push notifications and audible alarms when the device detects vibration or receives location information
  • View location and history while tracking on the map screen
  • Tracks maintenance history for safer riding
Download on the AppStore GET IT ON Google Play

※1. Compatible with BLE-supported Android 5.0 and above and iOS 11 and above.
※2. View a list of verified compatible smartphones.


Prevents theft and tampering.

Bike: De Rosa Protos, etc.

After having my Pinarello Dogma stolen, I started using AlterLock to prevent theft and tampering. Awareness is the key to prevention. I have installed AlterLock on all my bikes.

I was so relieved my bike was saved!

Luka Pyon
Bike: Merida Reacto 8000-E

I saw someone checking out my road bike, but I was too far away. He pulled a tool out of his pocket and broke the key. However, AlterLock detected the vibration and sounded its alarm, scaring him off.

It's great to have security and peace of mind.

Bike: Specialized Venge Pro

I bought it after hearing the buzz about it. I used to have a standard wire lock and was worried about leaving it while shopping at the convenience store. With AlterLock's excellent security, I have peace of mind. It's rock-solid—no doubt about it!


It can be attached to a standard sports bike using its bottle holder's base or in conjunction with your existing bottle holder.

It can be used within Sigfox's service area (primarily Europe). Outside the service area, all functions will work within the Bluetooth transmission range. You can check the service area from this page.
* Even within the service area, notifications may not reach your smartphone indoors where the signal is weak or in an environment with poor reception.

Bluetooth trackers are challenging to track once they leave your hands. AlterLock has stand-alone communication and GPS, so you can track your device wherever you go.

This product is designed specifically for theft prevention. It cannot be used as a GPS tracker that continuously displays location information. Vibrations made in lock mode activate the GPS to significantly reduce power consumption and enable long-term tracking.

If you try to remove the device, AlterLock detects the vibration and sounds an alarm to notify you, so you can rush to your bike. If you're still concerned, an additional anti-theft bolt and special tool are available. Please consider purchasing the device as a set. These items are not sold separately.

Is it possible to adjust the sensitivity of the alarm sound and vibration detection?

Device Specifications

Size159mm long x 38mm wide x 9mm thick
Battery Lithium polymer
Lithium polymerUSB Type-C
(charging cable not included)
TemperatureOperating Temperature -20~60℃
Chargeable Temperature 0~45℃
UptimeUp to 1.5 months
(varies according to usage)
Communications Bluetooth Low Energy / Sigfox
Location TrackinGPS (GNSS) / WiFi
Water/Dustproof IP66
AccessoriesStart Guide, 2 mounting bolts
Options2 anti-theft bolts, special tools
*Only sold in combination with the device


Product Price£114.99,€134.99(tax included)
Service Fee£3.49,€3.99/monthly(tax included)£34.99,€39.99/yearly(tax included)

30 day return policy
30 days of free service

How to use this service

Communication Areas

AlterLock transmits data via Sigfox (the LPWA communication standard) when outside of Bluetooth range. LPWA makes it possible for the device to communicate on its own with low power consumption and low cost.
Since Sigfox has different communication bands in different regions, Alterlock comes in several editions.

The European version is available in the following countries: Belgium, Croatia, Czech Republic, Denmark, France, Germany, Hungary, Ireland, Italy, Luxembourg, Portugal, Slovakia, Spain, Netherlands, United Kingdom and Finland.

* AlterLock is a registered trademark of Nextscape Co., Ltd.