Stamina 180 and Stamina 140 all bearings are covered from dust and dirt. On EVOLINK and Machine, all the bearing seals are covered from outside the frame but the inside of the bearings are visible. Not that the bearings need an extra seal, we decided to give the bearings a full cover by redesigning the links from a clean desk. We don’t believe in double seals as we have seen in other applications that extra seals just seal the condensed water inside as well. The new design protects the bearings from dirt and dust and keeps you riding longer.