Wheel bearing suitably for all oldtimers MZ BK 350. Suitably for front wheel and back wheel. Per wheel 2 pieces are required, the delivery occurs in pairs. The exact name is 6204 2Z or 6204 ZZ. Compared with the original built-in bearings which were open these are closed on both sides. Therefore these bearings are maintenance-free and must not be postgreased. The penetration of dust and moisture is decreased by the closed design what entails a substantially longer durability.