This is not directed at anyone, but nothing chaps my azz more than someone blowing up a group ride that is supposed to be at an advertised pace. If I choose to ride with a slower group it is because I am planning for a Z1 or Z2. Hard rides are done solo or on group rides advertised as drop rides, not at the expense of other people who came out to ride at an advertised pace. When the shoe get's put on the other foot, the person who was blowing up a ride is the first person to tell you to slow it down when they can't hang anymore.