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The Shimano Ultegra RD-R8050 Rear Derailleur Direct Mount B-Axle 2 is a factory replacement part that will replace a damaged or missing axle that is found on several Shimano road and gravel bike rear derailleurs. This B-Axle will attach the rear derailleur body to a direct mount style derailleur hanger or to a separate bracket axle unit that will join the conventional derailleur hanger of a bicycle to the derailleur body.
This product was added to our catalog on September 30, 2024