Hi, The Atera Linea bike rack is a serious piece of kit and having used it recently for a trip to Holland, with four bikes on, it performed brilliantly to the point that you almost forget that you have the bikes on the back. To answer your question the clear plastic strips are positioned such that the top and bottom brackets have something to rest on to avoid any potential damage to the paintwork. Both of the upper and lower clear strips should be applied so that they