101% over kill not even on my Orange Patriot down hill bike did I use more than 36 spokes, also I only use 36 on my S&M BMX, never felt the need for more spoke, I'm using 32 because Rohloff only make them with 32 and my tourer, and it will be use on and off road, 14 gauge tandem spokes and strong rims that are built well are all you'll need. IMHO I don't think you need more than 36.