Form each of your hands into a circle. Rotate your wrists, maybe even dislocate your shoulder, so your hands rotate like bike tires continuously. Position your head like it's the handlebars. Never break eye contact. Smile so wide you have to unhinge your jaw, showing your gaping maw.
Bicycles
Welcome to [email protected]
A place to share our love of all things with two wheels and pedals. This is an inclusive, non-judgemental community. All types of cyclists are accepted here; whether you're a commuter, a roadie, a MTB enthusiast, a fixie freak, a crusty xbiking hoarder, in the middle of an epic across-the-world bicycle tour, or any other type of cyclist!
Community Rules
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No bigotry - including racism, sexism, ableism, homophobia, transphobia, or xenophobia.
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Be respectful. Everyone should feel welcome here.
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No porn.
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No ads / spamming.
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Ride bikes
Other cycling-related communities
They're trying to tell someone "nice bike", not summon Cthulhu.
LOL
I usually just yell out "I love your bike!"
If I had to go with a hand signal though, I'd opt for the chef's kiss gesture.
If you are currently on a bike, point to yours, point to theirs, then thumbs up and smile. If you aren't on a bike, reconsider your life choices.
Say it! "Nice bike!". =)