[Shayne]

Hi Hans,

Thanks a lot, your reply put me on the right track 🙂

It turns out the noise is caused by Wi-Fi interference. The buzzing/ticking sound appears when the Wi-Fi connection with the smartphone is active.

Since I don’t need to connect my phone during regular rides, it’s not a dealbreaker for daily use.

By default, the K6 broadcasts its Wi-Fi for 3 minutes upon startup (and Wi-Fi cannot be completely turned off in the settings), so I reduced the standby timeout. I will check on my upcoming rides whether the noise is present during the initial boot broadcast or only during an active data link with the smartphone app.

Either way, knowing the root cause solves the mystery. Thanks again for your help 😉