Speed and cadence sensor for turbo trainer.

[Tony1963]

I've bought, and started using, a Jetblack turbo trainer. If I want to use a cadence and speed sensor, will any sensor do the job? It'll need to connect to Strava on my iPhone.
There is a Jetblack sensor available, but finding out the specifics I'm after isn't easy.

[millen]

I've been using a couple of Magene S3 on the spare bike - just £10-12 each compared to a Garmin or Wahoo sensor at 3x the price. It's a clever design - each time you replace the 2032 battery it switches from speed to cadence and back. I found the cadence is a lot better smoothed than the rubbish Cycplus sensors I tried before which registered silly spikes in cadence with each gear shift. The Magene itransmits on Ant+ and BLE so I'd assume it will work directly with smartphones as well as head units but might be worth confirming with them or on forums. This describes the installation https://www.youtube.com/watch?v=Mj4edSNTTcU Depending who you buy from, it might come with instructions only in Chinese, but easy enough to find in English on the web.

[Tony1963]

Thank you very much