G Sport Bird Cage Rims Item SpecificationsColorChromeWeight408Width34MaterialAlloyHub Drilling36Brake CompatibilityRim BrakeManufacturer Spec ERD383ValveStandard SchraderISO Diameter406 / 20" BMXValve LengthSchraderWheel Size20"Tire TypeClincherRim Center Offset0Defined ColorSilver