This standard specifies a marking system recommended to manufacturers to reduce incompatibility between bicycle parts produced to new international standards and traditional parts. When repairing bicycles and selling parts, you should first consider choosing the right parts. The distinguishing mark must be: Universal, that is, understandable by users and modifiers in various countries. Standardization, i.e. homogeneous marking of all bicycle parts. Practicality, that is, ease of use, is visible in all relevant parts.