It's easy.
"I can see your bottom bracket, nice."
"Whats a candy apple red San rensho like you doing at a bike rack like this?"
"You look differnt, did you just have your threads chased?"
"Are you a Louis Garneau? Because I see U and I together."
"Hi, are you street legal?"
"Hello, I may be a bike thief, but you stole my heart!"
"I bet you weigh sub-16 pounds. Can I pick you up?"
"Did you finish highschool? Because you've got beautiful dropouts"
"Do you know karate? Because your geometry is really kickin'"

ahaha thats enough