Originally Posted by
caloso
15" means 15 seconds. Sorry for the shorthand. Note that these will put a fair amount of stress on both the bike and the rider so make sure both are in good working order first.
I also neglected to mention that these are meant to be done out of the saddle and in the drops. If you don't have drop bars, just get as low as reasonably possible.
Thanks for the clarification. I think I'll try to do this one day this weekend. My bike has flat handlebars, but I'll see what I can do.