Originally Posted by Retro Grouch

Exactly!

Fixed gear bikes used to be out-of-the-mainstream which made them "in." They became so popular that the major manufacturers started producing fixed gear bikes, putting them into the mainstream, which made them "out." So now, since fixed gear bikes are "out" again, they are actually "in."

Unless, of course, your fixed gear bike is a road bike conversion. In that case it started life as "in" until it was converted to fixed gear which was never "in," even among the other fixed gear riders, so it was always "out" which is actually "in."

Got that?