Originally Posted by
HillRider
Cat-Eye used to sell the "Astrale" a wired computer with a rear wheel pickup for speed/distance and a cadence pickup so it would work fine on a trainer. The pickups were fastened to the nds chainstay and the magnets mounted on a rear wheel spoke and non-drive side crank arm. I have had one on my trainer bike for several years. The Astrale is discontinued but Cat-Eye still shows the "Strada Cadence" on their web site that seems to be a newer version of the same thing.
I've got the wired version of the Strada with Cadence on my road bike and it is great. Single wire runs to the back but there are separate pickups for wheel magnet and crank magnet. The Strada wireless has a single unit that mounts on the chain stay with both pickups in it. Haven't tried it but the reviews are positive. Probably go that way if the current one ever dies.