My term for these guys is "hammer boys." They are a dime a dozen here in San Francisco where the GG Bridge on the weekend seems to be some kind of bicycle roller derby. And, God help you if you get between two of these guys because then the one behind has to pass you in the most unsafe way possible, preferably when there are lots of bikers passing the other way, in order to assuage his/her embarrassment at getting separated from the pack.

It is so bad here on the weekends with these hammer boys that I don't even bother riding on the weekends any more.

Ray