aka_kim "Now I'm worried my shorts are threadbare and no one's bothered to tell me... "

as someone who will never be fast enough to ride in front of you, your shorts are fine, kim.

Bikerz was commenting, I call out bumps and signal turns....even though there's no one behind me .... ever.

"So how do you tell someone their butt is showing if you don't know them well?"

I like spazz's tattoo idea. Or work it into pre-ride routine; check brakes, inflate tires, would someone check my shorts?