The zipp 30 course rim brake rear clincher 700c wheel zipprsquos new 30 course clincher rim brake wheelset puts you tecircte de la coursehellip the head of the race or the gran fondo or your own adventure this wheelset rewrites zipprsquos own stringent rules for performance durability and versatility in an aluminum wheelset the 30 coursersquos wide rim profile and dependable hubset are engineered to deliver speed stability and comfort over any surface road bikes