Abstract: A tire tread 1 for a heavy civil-engineering vehicle to provide trade-off between resistance to mechanical attacks and thermal venting. The tread has a medial portion 11 with at least one longitudinal row of blocks 3, each being delimited transversely by two longitudinal channels 41 having a radially outer portion 411 and a radially inner portion 412, and longitudinally by two inter-block transverse cut-outs 42, having a radially outer portion 421 and a radially inner portion 422. The maximum thickness (E11max, E21max) of each outer portion (411, 421) is, at most, equal to 20% of the depth (P1, P2) of the cut-out (41, 42) and strictly less than the maximum thickness (E12max, E22max) of the inner portion (412, 422), and the minimum thickness (E11min, E21min) of each outer portion (411, 421) is at least equal to 5% of the depth (P1, P2) of the cut-out (41, 42).