General rule of thumb for me now is that that if they are wearing reflective shades, irrespective of their bike type, I ignore them unless they speak first. Been caught out too many times. Mind you, I was returning to my home town after a blast to Bridgnorth last year on my road bike. I'd been up at the crack of dawn and it was still very early. A roadie club were getting set for their ride, all assembled, but mostly dismounted, at the roadside. Every one of 'em had their eyes trained on me as I approached. I shouted a cheery "Good Morning", and not a one of 'em replied. Not a smile, wave, nod or word. Just cold stares as I went past. There must have been 12-15 of 'em. All heartless, ignorant feckers. "Well, that's club-riding out for me then", I thought. So I've now added club/group riders to the "give a miss" list....................