A base frame (34) which is universally usable for different modular structured conveying vehicles (30), in particular for shuttles (32), wherein the conveying vehicles (30) can travel horizontally along a travelling direction (52) in a storage and order-picking system (10), wherein the base frame (34) comprises a supporting frame (36) and a structure (38) connected to the frame (36), wherein at least the structure (38) is made of plastic only, and wherein the structure (38) comprises a plurality of component-specific seatings (58) being formed integrally with the structure (38) and being configured to positively hold in a resilient clamp at least one of the following functional components (60) of the respective conveying vehicle (30): a bearing (62); a driving unit (64); a sensor (66); an actuator (68); a load-handling device (70); a communication unit (78); a cabling (76); and an electric controlling unit (80) wherein each of the functional components (60) is positively insertable in or on the respective component-specific seating (58) along a component-specific mounting direction.