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BOX Hollow 20mm Freewheel Hubs
The BOX Hollow 20mm freewheel race hubs use cold forged and CNC machined 6061-T6 aluminum hub shells with oversized sealed cartridge bearings for greater reliability and 20mm hollow Through Axles designed to increase overall strength and stiffness while saving weight in the process. Compatible with 20mm frame and fork dropouts only.