12-2-markirovka-kolesnykh-diskov.html
12.2. Marking of rimsDesignation 5J 13 (5,5J 14) is deciphered as follows:
5 (5,5) – disk width in inches;
J — type of onboard edges of a rim of a disk (J-shaped);
13 (14) – the landing diameter of a disk in inches.
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