These metal shims allow you to adapt your bearings to a different frame. For a cotterless cycle with 40mm bearings, you can use these 40/42mm bearing adapters to allow you to put a 42mm frame onto your wheel.
Price is per pair.
CNC machined aluminum spacers adapt the 40mm (6203) bearings to any 42mm frame with 42mm bearings.
Manufactured in Taiwan.
NOTE: bearings not included