Nella UNECE 54 alla voce MARKING (pag 10)
https://www.unece.org/fileadmin/DAM/tra ... 054r2e.pdf3. MARKINGS
3.1. Pneumatic tyres submitted for approval shall display on both sidewalls in the case
of symmetrical tyres and at least on the outer sidewall in the case of asymmetrical
tyres:
3.1.1. The manufacturer's name or trade mark;
3.1.2. The tyre-size designation as defined in paragraph 2.17. of this Regulation;
3.1.3. An indication of the structure as follows:
3.1.3.1. On diagonal (bias-ply) tyres: no indication, or the letter "D";
3.1.3.2. On radial-ply tyres: the letter "R" placed in front of the rim-diameter marking and,
optionally, the word "RADIAL";
3.1.4. The speed-category symbol (or symbols);
3.1.4.1. An indication of the tyre's nominal speed category in the form of the symbol
prescribed in paragraph 2.28.2. above;
3.1.4.2. An indication of a second speed category in cases where paragraph 6.2.5. below is
applied;
3.1.5. The inscription M+S or M.S or M&S in the case of a snow tyre;3.1.6. The load-capacity indices as defined in paragraph 2.27. of this Regulation;
3.1.7. The word "TUBELESS" if the tyre is designed for use without an inner tube;
3.1.8. The date of manufacture in the form of a group of four digits, the first two showing
the week and the last two the year of manufacture. However, this marking, which
it is permissible to restrict to one sidewall, shall not be mandatory, on any tyre
submitted submitted for approval, until two years after the date of entry into force
of this Regulation; 3/
3.1.9. In the case of tyres which can be regrooved, the symbol "É" at least 20 mm in
diameter, or the word "REGROOVABLE", moulded into or on to each sidewall;
3.1.10. An indication, by the "PSI" index, of the inflation pressure to be adopted for the
load/speed endurance tests, as explained in annex 7, appendix 2. However, this
indication, which it is permissible to restrict to one sidewall, shall not be
mandatory, on any tyre submitted for approval, until two years after the date of
entry into force of this Regulation.
3.1.11. In the case of tyres first approved after 1 March 2004 the identification referred to
in paragraph 2.17.1.4. shall be placed only immediately after the rim diameter
marking referred to in paragraph 2.17.1.3.
3.1.12. The inscription "ET" or "ML" or "MPT" for "Special use tyres". 4/
3.1.13. The suffix "C" or "LT" after the rim diameter marking referred to in
paragraph 2.17.1.3., and, if applicable, after the tyre to rim fitment configuration
referred to in paragraph 2.17.1.4.:
3.1.13.1. this marking is optional in the case of tyres fitted on 5° drop centre rims, suitable
for single and dual fitment, having a load capacity index in single lower or equal
to 121 and destined for the equipment of motor vehicles.
3.1.13.2. this marking is mandatory in the case of tyres fitted on 5° drop centre rims, suitable
for single fitment only, having a load capacity index higher or equal to 122 and
destined for the equipment of motor vehicles.
3.1.14. The suffix "CP" after the rim diameter marking referred to in paragraph 2.17.1.3.,
and, if applicable, after the tyre to rim fitment configuration referred to in
paragraph 2.17.1.4. This marking is mandatory in the case of tyres fitted on 5°
drop centre rims, having a load capacity index in single lower or equal to 121 and
specifically designed for the equipment of motor caravans.
3.1.15. The inscription "FRT" (free rolling tyres) in the case of tyres specifically designed
for the equipment of trailers.
3.2. Tyres shall exhibit a free space sufficiently large to accommodate an approval
mark as shown in annex 2 to this Regulation.
3.3. Annex 3 to this Regulation gives an example of an arrangement of the tyre
markings.
3.4. The markings referred to in paragraph 3.1. and the approval mark prescribed in
paragraph 5.4. of this Regulation shall be moulded on to or into the tyres. They
shall be clearly legible and shall, except for the marking referred to in
paragraph 3.1.1. above, be located on at least one lower sidewall.
3.4.1. However, for tyres identified by the "tyre to rim fitment configuration" (see
paragraph 3.1.11.) symbol "A", the markings may be placed anywhere on the
sidewall of the tyre.
Quoto.... e seguo con interesse... 
e proprio in quel momento che mi ha passato la UNECE.... ma non ci capisco una mazza....
