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Tyre valves. Dimensions and designation Ingestion-build-51215 ISO 27501 discusses the guidelines1 Scope This document defines the essential dimensions and the designation of tube valves and tubeless valves. Annex B gives the correspondence between ISO designations and the designations established by: TRA (Tire and Rim Association Inc.); ETRTO (European Tyre and Rim Technical Organisation); JATMA (The Japan Automotive Tyre Manufacturer's Association, Inc.). In the remainder of this document, all the dimensions are given at their nominal value