The smart, accessible security solution for your ride.
Added peace of mind for you and your bike.
Anti-theft alarm and GPS tracker for your ride.
Smart security for added protection.
Protecting your bike just got easier, with AlterLock.
Keeping you in control at all times.
The smart, accessible security solution for your ride.
Added peace of mind for you and your bike.
Anti-theft alarm and GPS tracker for your ride.
Smart security for added protection.
AlterLock evolved
AlterLock has evolved even further.
We’ve retained the concept of movement detection alarms and tracking features, while enhancing transmission area, device tracking performance, durability, and uptime. With riders and cyclists in mind, we’ve modernized the functionality everyway conceivable.
The advanced AlterLock Gen3 system bolsters sense of security and amplifies the joy of riding to a new level.

Motion detection alarm for peace of mind
When motion is detected a loud alarm sound of up to 95dB is triggered to deter theft by a loud alarm sound of up to 95dB. The motion detection sensitivity and alarm sounding time can be adjusted to accommodate a variety of situations and provide peace of mind, even on a bike rack.
Although taking extra precaution is highly recommended, we have received many reports of cases where the alarm went off causing the perpetrator to fleeing the scene.
In most cases, it is important to prevent theft before it happens.
Evolved transmission performance
When the device detects movement, the device will send out a signal (by Bluetooth for close range and LTE-M / NB-IoT transmission over long distances) to notify the user of the anomaly via a unique notification tone from the app.
Compared to previous model, AlterLock Gen3 boasts significantly improved transmission performance and reception capability in a wide range of areas globally.


Improved tracking performance
In the unlikely event that your bike is stolen, AlterLock can track it using GNSS (GPS & Galileo), Wi-Fi and 4G base station signals to attempt to locate the final location both indoors and outdoors.
AlterLock Gen3 has improved the algorithm for acquiring location information to shorten positioning time and improve accuracy. This new system is the first of its kind in the world.
Unlike loss prevention devices like Bluetooth tracker, AlterLock independently tracks its location.
Eliminate Ride Anxiety
Do you want to enjoy cycling but worried about theft?
Are you comfortable with just a wire lock, but don’t want to carry heavy bolt locks?
Even during café rides or quick breaks, most people feel insecure about taking their eyes off the bike.
Even storing bikes on the home premise causes significant level of anxiety.
With AlterLock, you can always check the presence of your bike from the app.
Significant sense of security.
Three locking methods
Three lock/unlock operations are provided with the rider and cyclist in mind.
You can take a break between rides and get going right away without having to remove your gloves or take out your phone each time.
App operation | One-tap operation from the AlterLock app |
Button operation | When the phone is in close proximity, push the buttons on the main unit. |
Auto-Lock | Automatically locks when the phone is away from device. Automatically unlocks when the phone is within range. |
Countermeasures against false positives
Worried about accidentally setting off an alarm?
The first warning alarm is designed to set off to serve as a short warning.
In case of actual theft, a loud alarm can be used to deter further action.
The alarm duration can be set anywhere from 5 to 60 seconds, and there is also an option to mute the alarm sound if situation may fit. With all settings easily adjustable via the app, there is no need to worry about the alarm ringing continuously and disturbing neighbors.
Compatible with bike racks
By setting the detection sensitivity to “Low,” which is optimized for cycle rack usage, the system can be used with peace of mind even if there is some lateral swaying due to wind or other rack users nudging your bike.

Small and lightweight
The device weight is about 50g, which is comparable to a small cycle computer. Since it is sandwiched between the bottle cage and the bike frame, aero performance is not largely affected.

Water and dust resistance
The waterproof and dustproof performance is IP66 which means there is no problem even if you wash your bike while the device is attached to your bike. The housing structure has been greatly improved to enhance waterproof performance and durability for Gen3.

Long run time
By reducing power consumption through advanced programming, Gen3 achieves up to 3 months of run time, which is approximately twice as long as the previous Gen2 model. The charging port uses USB Type-C.
User Testimonials
This is a very good product as it improves my worries about theft a lot.
However, I over-torqued the screws and they cracked through the screw holes... out of three. All of them did so.
I thought the torque strength was too sensitive for me.
Not only does it prevent theft, but it is also very effective in preventing tampering and making people hesitant to touch it.
Now you can park your bike with peace of mind!
Had my LaPierre bike stolen after thieves used a grinder to cut the security. But by coordinating with the local police using the Alterlock positioning the bike was sucessfully recovered. Would highly recommend.
Setup was easy.
The use of AlterLock in addition to the keylock gives me peace of mind.
The volume could be louder.
It would let me know if there is something unusual even if I am out of sight... I think this alone is worth installing. I have installed it in both of the cars I own.
But don't be overconfident, do daily test runs, etc. to check whether the alarm goes off normally? Do you receive notifications on your phone? If the system does not notify you of an abnormality, you should check the status of the system.
I had a problem before where no notifications were sent out, and when I contacted support, they kindly told me how to deal with the problem, which was a relief, but I feel that checks should be carried out to avoid missing something that is not working...
I'm generally happy with it, but overall I feel like it could still be improved.
I'm hoping for more features and specs in updates and gen3.
Real-time tracking with updates every second or so.
Battery life more than doubled.
Stable Bluetooth connection range.
Connecting, unlocking and locking with Apple Watch.
Vibration + alarm function at 5m of positional movement.
Other functional improvements are expected.
The last major system of vibration detection has a lot of false positives, and I feel it would be easier to use if a system that recognises by GPS position movement could also be added as a mode.
It's a lot more stable, but sometimes I get a bad connection. It can be fixed by restarting the device, so it's okay.
With the wire lock alone, it was unnerving just to be away for a short while, but it gives me peace of mind and allows me to take a break. In case the alarm goes off, I use a smartwatch, which is very convenient for me because I can notice the notification more easily than with my phone.
I use it together with the Abs Blade Lock.
I haven't yet had a situation where the alarm sounds, but it gives me peace of mind when I'm away from my road bike, for example for lunch.
We also use wire locks, but they are not as secure. Road bikes are not cheap, so I can rely on the Alterlock to be as effective as a car security alarm. The only thing I would like to see improved is better battery life. Also, it would be helpful if you could notify me via a notification on my phone when the battery is about to run out.
I often ride my road bike alone and my breaks are almost always at convenience stores, so I can now go to the toilet without worry that I will be out of sight.
I also feel safe in the fact that it is a deterrent, as habitual thieves will be aware of the famous Alterlock.
The operating sound when locking and unlocking also appeals to those around you.
I had it fitted at a bicycle shop. It does not spoil the aesthetics of the bike under the bottle gauge. When I park my bike out of sight, I use a chain lock and here. I think it is a necessity for a good bicycle rider. However, the batteries need to be recharged every time you ride.
I use it inside my house and in a covered bicycle parking area in front of the station, and the GPS works inside my house, but it doesn't pick up the GPS at all in the covered bicycle parking area. I am worried if it really works when stolen.
Sometimes the notifications don't arrive as often as they are supposed to, but I'm generally satisfied.
I think it's a very good prevention against theft.
I've never had it work when I'm parked on my bike yet, so sometimes I wonder if it's safe, but I can think it's safer than not doing anything at all.
In that respect, I'm glad I have it on.
Operating the app when locking and unlocking the door is a hassle.
There is a lag between launching the app and the Bluetooth connection, which was not as smooth as I had imagined.
The physical buttons also react differently, sometimes they do and sometimes they don't.
The service itself is very good, so it would be nice to be able to lock and unlock more easily.
I have been using it for six months.
I am approximately satisfied with the frequency of charging and the accuracy of the locations it displays. I am not sure if it will really help me if I have a problem, as it does not show the location in real time. Also, the location information is sometimes interrupted when you move outside of your home. There is room for improvement in this area, so 3 stars.
I ride solo a lot and was really worried about convenience stores and during meals, but this product has allowed me to enjoy my rides with peace of mind.
This is a very good product as it improves my worries about theft a lot.
However, I over-torqued the screws and they cracked through the screw holes... out of three. All of them did so.
I thought the torque strength was too sensitive for me.
Not only does it prevent theft, but it is also very effective in preventing tampering and making people hesitant to touch it.
Now you can park your bike with peace of mind!
Had my LaPierre bike stolen after thieves used a grinder to cut the security. But by coordinating with the local police using the Alterlock positioning the bike was sucessfully recovered. Would highly recommend.
Setup was easy.
The use of AlterLock in addition to the keylock gives me peace of mind.
The volume could be louder.
It would let me know if there is something unusual even if I am out of sight... I think this alone is worth installing. I have installed it in both of the cars I own.
But don't be overconfident, do daily test runs, etc. to check whether the alarm goes off normally? Do you receive notifications on your phone? If the system does not notify you of an abnormality, you should check the status of the system.
I had a problem before where no notifications were sent out, and when I contacted support, they kindly told me how to deal with the problem, which was a relief, but I feel that checks should be carried out to avoid missing something that is not working...
I'm generally happy with it, but overall I feel like it could still be improved.
I'm hoping for more features and specs in updates and gen3.
Real-time tracking with updates every second or so.
Battery life more than doubled.
Stable Bluetooth connection range.
Connecting, unlocking and locking with Apple Watch.
Vibration + alarm function at 5m of positional movement.
Other functional improvements are expected.
The last major system of vibration detection has a lot of false positives, and I feel it would be easier to use if a system that recognises by GPS position movement could also be added as a mode.
It's a lot more stable, but sometimes I get a bad connection. It can be fixed by restarting the device, so it's okay.
With the wire lock alone, it was unnerving just to be away for a short while, but it gives me peace of mind and allows me to take a break. In case the alarm goes off, I use a smartwatch, which is very convenient for me because I can notice the notification more easily than with my phone.
I use it together with the Abs Blade Lock.
I haven't yet had a situation where the alarm sounds, but it gives me peace of mind when I'm away from my road bike, for example for lunch.
We also use wire locks, but they are not as secure. Road bikes are not cheap, so I can rely on the Alterlock to be as effective as a car security alarm. The only thing I would like to see improved is better battery life. Also, it would be helpful if you could notify me via a notification on my phone when the battery is about to run out.
I often ride my road bike alone and my breaks are almost always at convenience stores, so I can now go to the toilet without worry that I will be out of sight.
I also feel safe in the fact that it is a deterrent, as habitual thieves will be aware of the famous Alterlock.
The operating sound when locking and unlocking also appeals to those around you.
I had it fitted at a bicycle shop. It does not spoil the aesthetics of the bike under the bottle gauge. When I park my bike out of sight, I use a chain lock and here. I think it is a necessity for a good bicycle rider. However, the batteries need to be recharged every time you ride.
I use it inside my house and in a covered bicycle parking area in front of the station, and the GPS works inside my house, but it doesn't pick up the GPS at all in the covered bicycle parking area. I am worried if it really works when stolen.
Sometimes the notifications don't arrive as often as they are supposed to, but I'm generally satisfied.
I think it's a very good prevention against theft.
I've never had it work when I'm parked on my bike yet, so sometimes I wonder if it's safe, but I can think it's safer than not doing anything at all.
In that respect, I'm glad I have it on.
Operating the app when locking and unlocking the door is a hassle.
There is a lag between launching the app and the Bluetooth connection, which was not as smooth as I had imagined.
The physical buttons also react differently, sometimes they do and sometimes they don't.
The service itself is very good, so it would be nice to be able to lock and unlock more easily.
I have been using it for six months.
I am approximately satisfied with the frequency of charging and the accuracy of the locations it displays. I am not sure if it will really help me if I have a problem, as it does not show the location in real time. Also, the location information is sometimes interrupted when you move outside of your home. There is room for improvement in this area, so 3 stars.
I ride solo a lot and was really worried about convenience stores and during meals, but this product has allowed me to enjoy my rides with peace of mind.
This is a very good product as it improves my worries about theft a lot.
However, I over-torqued the screws and they cracked through the screw holes... out of three. All of them did so.
I thought the torque strength was too sensitive for me.
Not only does it prevent theft, but it is also very effective in preventing tampering and making people hesitant to touch it.
Now you can park your bike with peace of mind!
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Easy Installation
30-day free trial
A free period of up to 30 days is applies to the initial service contract.
You can cancel at any time, including during the free period.
















FAQ
It can be attached to a majority of standard sports bike using its bottle cage mount or in conjunction with your existing bottle cage.
Many users are also using AlterLock on motorcycles. It is expected to be stored under a locked seat or other location away from high temperatures.
A security bolt and installation tool are included, making removal with ordinary tools difficult. In addition, if an attempt is made to remove the device while in lock mode, it will detect movement and sound off a loud alarm to deter theft and notify your phone to prompt your intervention.
AlterLock is not a physical lock. To increase security, we highly recommend a wire lock or other physical lock to be used in conjunction with the AlterLock.
Bluetooth-based trackers are primarily inteded to prevent the loss of portable items. They transmit location information when a smartphone is in the vicinity, but are not suitable for tracking moving vehicles.
AlterLock has stand-alone communication capability and supports GPS/Wi-Fi positioning, so it can be tracked anywhere.
AlterLock is intended as theft prevention device and does not work like a real-time GPS tracker that displays location information at all times. By sending location data only when detecting motion during locked state, power consumption can be reduced and long-term tracking is made possible to aid recovery.
You can choose from 3 type of alarm sound, on/off, alarm duration, and number of alarms allowed can be finely adjusted. Detection sensitivity can also be adjusted in three levels.
Product Specifications






Product name / Model number | AlterLock Gen3 / AL03GB |
Dimensions of main unit / Weight | Length: 167mm Width: 28mm Thickness: 9mm / 53g *1 |
Battery | Lithium polymer / Up to 3 months runtime *2 |
Charging port | USB Type-C *3 |
Operating / Charging temperature | -20 – 60°C / 0 – 45°C |
Transmission system | Short range: Bluetooth, Long range: LTE-M / NB-IoT *4 |
Positioning system | GNSS (GPS / Galileo), Wi-Fi, 4G base stations |
Sensor | 3-axis accelerometer |
Alarm | Maximum 95dB *5 |
Water and dust resistance | IP66 |
Accessory | Security bolt, installation tool, sticker |
*1 Includes security bolts.
*2 Varies depending on usage conditions.
*3 Charging cable is not included.
*4 The long-range transmission method automatically changes depending on the region used.
*5 Measured at a distance of 10 cm from the product.
About the AlterLock App






Operate your AlterLock device from a dedicated app.
Compatible with smartphones running Android 8.0 or higher or iOS 15 or higher
Main features of the application
Register your bike information | Record photos, specs, features, VIN, etc. |
Device operation | Lock and unlock |
Device configuration | Movement detection sensitivity, auto-lock, alarm sound, notification, periodic transmission, accident detection, etc. |
Map display | Current location and history |
Maintenance records | Maintenance history management and reminder function (*only for bicycles) |
Service agreement
A service contract is required to use the data transmission and other functions of the AlterLock Gen3 device.
AlterLock Gen3 is available in the following countries
Japan, Australia, Belgium, Croatia, Czech Republic, Denmark, Estonia, Finland, France, Germany, Latvia, Luxembourg, Netherlands, Norway, Romania, Slovak Republic, Slovenia, Spain, Sweden, United States
*In the UK, Ireland, Italy and Canada, due to connectivity issues with communication providers, the device has been temporarily removed from the communication area.