RIVAROSSI HC6101AC wheel sets (2 pcs.), axle length: 24,25 mm, wheel diameter: 11,27 mm, e.g. fits for many 2-axle wagons (Rivarossi, Jouef, Electrotren)
RIVAROSSI HC6102AC wheel sets (4 pcs.), axle length: 24,25 mm, wheel diameter: 10,50 mm, e.g. fits for UIC X coaches (Rivarossi, Electrotren) as well as Talgo III and Talgo Pendular trains (Electrotren)
RIVAROSSI HC6104AC wheel sets (4 pcs.), axle length: 24,00 mm, wheel diameter: 11,50 mm, e.g. fits for German OSShD, type B coaches (Rivarossi)