Sometimes I nod and give a lift of the fingers off the bars, other times I don't. It depends on where I'm at in my workout. If I'm doing intervals, I can't break out of that just to acknowledge another cyclist...particularly where I live. On a Saturday ride on the coast, I might encounter hundreds of them.

I realized long ago that cyclists are out there for a myriad of reasons and I don't take anything personally. When I do wave, I'm an equal opportunity waver, no matter the bike they're riding.