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J-K Bike - Mechanical Disaster Prevention

App that helps build positive bike maintenance behaviours, for rides quick, big
New in version 3.5.0
- Added ability to exchange component data directly with jkbike.net/mdp/components/ for editing in browser
- New permission: CAMERA for scanning QR codes
- Slightly changed how activities show on the Home screen
- Added automatic export as backup, incl. pruning of automatic backups (configurable)
- Minor updates to a couple of libraries
We have all experienced those rides where something mechanical happens that really was preventable. As the authors, even though we take a certain pride in our own efforts in maintaining smooth running MTBs, and a disdain for our riding buddies who never give a passing thought until something goes 'CRUNCH!' in a ride-ending manner, there are still innumerate situations where something that should have been checked, or usually never needs checked after proper installation, has not been.

'Where is that vibration coming from?', 'why is the rear end creaking?', 'What is that terrible knocking?' are so often result of something relatively simple being overlooked or forgotten. Recent favourites have been disc rotor bolts backing out, rear thru axles not done up properly, and headsets improperly tensioned.

So, to prevent mechanical disasters happening on your rides, use this app to build better, new, habits and ensure your rides are (mechanically) glorious.

The app can connect ot Strava and update mileages/distances as well as last ride dates.

This app uses INTERNET and ACCESS_NETWORK_STATE permissions to download template activities from a github repository at https://github.com/janexner/JKBikeTemplateActivities, and to retrieve data from 3rd-party integrations, currently with Intervals.icu only. No internet access beyond that.
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Versions

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

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  • Version 3.5.0 (21) suggested Added on Oct 07, 2025

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 10 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • take pictures and videos
      This app can take pictures and record videos using the camera while the app is in use.
    • run foreground service with the type "dataSync"
      Allows the app to make use of foreground services with the type "dataSync"
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • show notifications
      Allows the app to show notifications

    Download APK 6.5 MiB PGP Signature | Build Log

  • Version 3.4.1 (20) - Added on Sep 29, 2025

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 10 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • run foreground service with the type "dataSync"
      Allows the app to make use of foreground services with the type "dataSync"
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • show notifications
      Allows the app to show notifications

    Download APK 6.2 MiB PGP Signature | Build Log

  • Version 3.3.1 (18) - Added on Sep 16, 2025

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 10 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • run foreground service with the type "dataSync"
      Allows the app to make use of foreground services with the type "dataSync"
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • show notifications
      Allows the app to show notifications

    Download APK 6 MiB PGP Signature | Build Log

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