Tyrum est exterius fistula, interiorem fistulam et cervical balteus.
In structura de exteriori strigare: I - Bead II - Cushion Layer III - Tread IV - Condinus V - VI - VI - latus.
EPDM potest esse parte in interiore fistulae et sidewalls.

EPDM, S537-3; S537-2; S55a; J-MMXL: J-MMLXX, TER (IV) XLVII;