Rider speed varies and eventually we break into 2 or 3 groups of similar speed but we try to keep regrouping for meals, etc. Often a couple of we stronger riders trade off when it comes to running sweep or scouting ahead. We've had people join us that were either much faster or slower than our group and never returned and I understand completely. At times you have to be willing to compromise when group riding but that's the price you pay to have company and help when needed. Sure not for everyone.