if on a fixed bike you can just use the cheapest computer you can find and work out the cadence for certain speeds or if it's with gears/ss get the cateye strada cadence like Branwen linked to ^^ there. You can probably find it cheaper on ebay or something. Wireless is easier and neater, but I have the wired one on my road bike and if you put care in to it then the wires are barely noticeable.
-Sumo.
if on a fixed bike you can just use the cheapest computer you can find and work out the cadence for certain speeds or if it's with gears/ss get the cateye strada cadence like Branwen linked to ^^ there. You can probably find it cheaper on ebay or something. Wireless is easier and neater, but I have the wired one on my road bike and if you put care in to it then the wires are barely noticeable.
-Sumo.