A tire (1) for a trailer of a heavy-duty vehicle having a tread (2), which has at least one complex circumferential cut (7) in a median portion (4) having a first family of transverse cuts, referred to as transverse through-sipes (81), having a thickness (E1) at most equal to 0.8 mm, a depth (P1) at least equal to 20% of the maximum depth-of-cut (H), and being at a distance (D1), from the nearest external cavity (71), at least equal to 7 mm, and/or a second family of transverse cuts, referred to as blind transverse cuts (82), that stop near an external cavity (71), that have a thickness (E2) at least equal to 1 mm, a depth (P2) at most equal to 20% of the maximum depth-of-cut (H), and being at a distance (D2), from said external cavity (71), at least equal to 3 mm.

To provide a motorcycle tire enhanced in steering stability, particularly, the feeling of falling during rolling. A motorcycle tire in which a directional pattern including at least one center main groove 11 is provided on a tread surface portion. A negative rate of the entire tread surface portion is 10% or less, and a ratio Gs/Gc between shear rigidity Gs at a position of of a tread width TW from a tread edge TE as measured in a tire width direction and shear rigidity Gc at a position of of a tread width TW from a tread edge TE as measured in a tire width direction, in the tread surface portion, is 95% to 100%.

The present invention provides a pneumatic tire which is sufficiently reduced in the rolling resistance during high-speed travel, while having sufficiently improved chipping resistance. A pneumatic tire which has a tread part, wherein: at least one rubber layer that forms the tread part contains a rubber component that contains an isoprene rubber, a styrene butadiene rubber and a butadiene rubber, while containing more than 5 parts by mass but 25 parts by mass or less of carbon black relative to 100 parts by mass of the rubber component; and if Wt (mm) is the cross-sectional width of the tire, Dt (mm) is the outer diameter of the tire, and V (mm.sup.3) is the virtual volume that is the volume of the space occupied by the tire when this pneumatic tire is installed on a standardized rim and the internal pressure is 250 kPa, (formula 1) and (formula 2) are satisfied.
1700(Dt.sup.2/4)/Wt2827.4(formula 1)
[(V+1.510.sup.7)/Wt]2.8810.sup.5(formula 2)