An aerodynamic tailfin rotatably attached to a shaft-shaped member disposed on a vehicle. The tailfin swivels about the round shaft-shaped member for reduced drag in response to winds varying in direction impinging thereon.

A tire (10) includes, in a tread surface (11): at least two circumferential grooves (12, 13) extending in a tire circumferential direction; and a land portion (14) sandwiched between the circumferential grooves (12, 13). The land portion (14) has a resonator (15) including: an air chamber (16); a first branch groove (17); and a second branch groove (18). The two circumferential grooves consist of: a first circumferential groove (12) having a smaller cross-sectional area in a cross section along a plane perpendicular to extending direction of the circumferential grooves; and a second circumferential groove (13) having a larger cross-sectional area in a cross section along a plane perpendicular to extending direction of the circumferential grooves. A centroid (C) of the air chamber (16) is situated to a side closer to the first circumferential groove (12) with respect to a tire widthwise center (CL) of the land portion (14).

Provided is a pneumatic tire in which circumferential narrow grooves are disposed at a tire width direction disposal density of from 0.06 grooves/mm to 0.2 grooves/mm. Width direction narrow grooves include at least one bent portion. The bent portion has a bend angle of not less than 40 and not more than 160.

A tyre includes a tread portion provided with an outer main groove, an inner main groove, and a middle main groove. Each of the main grooves has a pair of groove edges arranged on both sides in a tyre axial direction and extending in a tyre circumferential direction. At least one of the groove edges includes circumferential portions extending in the tyre circumferential direction and axial portions inclined at larger angles than the circumferential portions with respect to the tyre circumferential direction. When an axial portion total length is a sum of axial lengths of the axial portions included in the main grooves, an axial portion total lengths L1, L2, and L3 of the outer main groove, the middle main groove, and the inner main groove, respectively, satisfy Expressions (1) and (2) shown below;

L1>L3Ex. (1)

L1L2L3Ex. (2).

A tyre for running on rough terrain includes a tread portion. The tread portion includes a crown region, middle regions, and shoulder regions. The crown region is provided with a plurality of crown blocks. The middle regions are provided with a plurality of middle blocks. The shoulder regions are provided with a plurality of shoulder blocks. Each of the middle blocks is connected with at least one of the crown blocks by a crown tie bar and connected with at least one of the shoulder blocks by a shoulder tie bar. A land ratio of the shoulder regions is 90% or more and 115% or less of a land ratio of the crown region.

A tyre mold for curing and molding a tyre includes a plurality of tread segments for molding a tread rubber of the tyre. The plurality of tread segments, upon being connected with one another in a mold circumferential direction, forms a tread molding-surface that is substantially continuous in the mold circumferential direction through parting lines that appear between adjacent tread segments. The parting lines include one or more inclined parting lines inclined with respect to a mold axial direction, and the inclined parting lines extend straightly between ends in the mold axial direction of the tread molding-surface.

A minimal fairing apparatus minimally shielding the faster-moving drag-sensitive uppermost wheel surfaces from headwinds reduces overall vehicle drag. The apparatus includes various upper wheel fairings of FIGS. 1-6. Each fairing shields a primary vehicle-drag-inducing upper wheel surface from headwinds otherwise impinging thereon.

A tire 1 includes a tread portion 2, and how the tire is to be oriented when mounted to a vehicle is specified for the tire. The tread portion 2 has an outer tread edge T1, an inner tread edge T2, a first crown main groove 4, a second crown main groove 5, and three land portions demarcated by the first crown main groove 4 and the second crown main groove 5. The land portions include an outer shoulder land portion 7 demarcated between the outer tread edge T1 and the first crown main groove 4. The outer shoulder land portion 7 has a largest width in a tire axial direction among the three land portions. The outer shoulder land portion 7 has an outer shoulder lateral groove 20 and an outer shoulder sipe 21.

A pneumatic tire includes a narrow groove on a tread surface, inclined from the tire circumferential direction, groove width being smaller than groove depth, and an air inflow part opening to the tread surface and formed on one of the opposing groove walls. At least one end of the narrow groove is a terminal end. The air inflow part is disposed at the terminal end of the narrow groove, and in a development plan view of the tread surface, XOY is an acute angle, where O is an intersection between a widthwise center line of the air inflow part and a groove widthwise center line of the narrow groove, X is a terminal endpoint of the air inflow part along the widthwise center line of the air inflow part, and Y is a lengthwise center point of the narrow groove along the groove widthwise center line.

An annular tire sleeve is provided for being installed onto a tire for skid avoidance training. The sleeve has a low friction tread on the exterior surface for making contact with the road and an array of studs on the interior surface for engaging and securing the sleeve to the tire. The studs project out from the interior surface to form a point. A flange is integrally formed from an outside edge of the sleeve extending radially inward to maintain the sleeve on the tire shoulder during a skid.