Went by lbs to get an adjustment on drive train, and the owner and 1 of their veteran riders were in a bad spill, 1 broken collar bone and some pretty serious facial rash and bruises. They said that a rider hit the brakes in front of them for unexplained reason. I have been trying to work my way up to first group ride, this has been a concern of mine, either causing a wreck like this or being involved in one. They were by their description moving at a fast pace when this happened. I think I`ll spend a few more weeks working on riding skills and holding a good line, still have a tendancy to wobble a good bit when taking a drink or just stretching a little.