| 摘要 |
A tread ( 1 ) provided with a plurality of cutouts ( 5, 6, 71, 72, 73, 81, 82, 83 ) of essentially transverse orientation and characterized in that: when new, some of the transverse cutouts ( 5, 6 ) form on the running surface hollowed zones of average width Lt greater than or equal to 2 mm and of maximum depth Pt at most equal to 80% of the thickness Pb of tread to become worn, the other transverse cutouts ( 71, 72, 73, 81, 82, 83 ) forming on the same running surface incisions ( 71', 72', 73', 81', 82', 83' ) of average width Li less than 2 mm and of depth Pi at most equal to Pt; a plurality of the incisions ( 71', 72', 73', 81', 82', 83' ) extending by hollowed zones ( 71'', 72'', 73'', 81'', 82'', 83'' ) such that after homogenous wear of the tread the volume V 1 of the hollowed zones ( 71'', 72'', 73'', 81'', 82'', 83'' ) opening on to the new running surface is between 50% and 150% of the volume V 0 formed by the hollowed zones when new. A molding element comprising thick parts and thin parts.
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