Several wireless computers that measure speed have their speed sensor be a combo speed/cadence sensor. I just got a Garmin Edge 305, and the same unit measures both. But you don't have to put the cadence magnet on the crank arm. A separate spoke magnet does the speed part.
The much cheaper 205, on the other hand, only measures speed, not cadence. It's also wireless.
I think the Polar 200 computer can be bought more cheaply without the cadence sensor too.
One of CatEye double wireless models is speed/HR while another is speed/CAD




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