Hi All, I have a very noticeable ticking/clicking noise coming from my back wheel I assume. It is there at all speeds and gears constantly, as if something is brushing the spokes. The bike is a Shimano steps crank drive Volt Axis. I have looked incessantly into this, it only occurs when I am seated on the bike. I have had the bike up on its stand turning the pedals fast in all of its eight gears and it’s then silent no clicking noise, only when I am sitting on bike .Any suggestions much appreciated.