On October 19 I receive a mail from AlterLock that I was part of their Reviewer Recruitment Campaign and that would send me a device for reviewing and testing. A couple of days later I received the device per mail and the assembly could be started, a very easy process as the lock is placed behind one of your bottle holders.

What is AlterLock?

AlterLock is a security service for sports bikes. It lets you keep a remote eye on your bike with a movement detection alarm and smartphone notification. In the unlikely event that the alarm doesn’t prevent theft, GPS tracking helps you find your bike. It’s a new way to enjoy your life as a cyclist with peace of mind. Next to the device itself you also need a subscription, see below.

Device specifications

Size159mm long x 38mm wide x 9mm thick
BatteryLithium 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)
CommunicationsBluetooth Low Energy / Sigfox
Location TrackinGPS (GNSS) / WiFi
AccessoriesStart Guide, 1 tool for securing the mounting bolts, 2 secured mounting bolts, 2 spare mountain bolts, 2 USB dust covers and 4 stickers

App Features

  • Register a photo of your bike together with its specs and serial number
  • Toggle the device’s Lock mode
  • Device settings (for various situations including movement detection sensitivity, alarm on/off, alarm duration, initial alarm sound, number of alarms, and regular transmission)
  • Push notifications and audible alarms when the device detects your bike is being moved or receives location information
  • View location and history while tracking on the map screen
  • Tracks maintenance history for safer riding


To use your AlterLock device, you need to subscribe to the Bicycle Guard Service.

Monthly PlanAnnual Plan
€3.99(including tax)€39.99(including tax)

How to use it?

Using it is pretty simple….. you go to the App and push the little lock icon add the bottom. The slider moves to the right and you have a visual indication that your bike is locked. Also during this process the AlterLock itself gives a loud beep, audio notification. Both together secures you that you have locked your precious.

When your bike is moved during this locked status it starts to give a number of louds beeps (depending on your settings). Also you will receive a notification on your phone that you will need to check your bike immediately. When you find your bike just moved you can register a misdetection but in the worst scenario you can on the spot enter the register information about your stolen bike, something you of course hope to never need to do!!


If is what a bit smaller they would absolutely get 5 stars but that is the only point of critic I can have about this lock. Having the Bluetooth, GPS and WiFi option is absolutely a game changer!

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