Sounds to me like he wants something simple and cheap (since he uses free Strava) - like a Cateye - with a magnet attached to the spokes and a sensor attached to the fork. Old skool but it’s simplicity at its best?
https://www.amazon.com/CAT-EYE-Compu...s%2C175&sr=8-7
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“A watt saved is a watt earned” 🚴🏻♂️
Not a CAT