A contour CL of a carcass 12 includes a curved portion 44 and an inversely curved portion 46. A boundary between the curved portion 44 and the inversely curved portion 46 is an inflection point PV. A part or an entirety of the curved portion 44 is represented by a first arc. A part or an entirety of the inversely curved portion 46 is represented by a second arc. The first arc and the second arc are tangent to each other at the inflection point PV. A ratio (X/W) of a distance X in an axial direction to a distance W in the axial direction is not less than 70% and not greater than 85%. A ratio (Y/H) of a distance Y in a radial direction to a distance H in the radial direction is not less than 15% and not greater than 22%.

A wheel component for sports and racing bicycles with an annular tire and a central tread surface, which in proper use in straight-ahead travel on a plane ground circumferentially makes contact with the surface of the ground, and which opens up a central longitudinal sectional plane. Planar aero elements are configured on the surface of the annular tire, laterally spaced apart from the longitudinal sectional plane. The aero elements are configured as depressions in the surface of the tire and are disposed on the side surfaces and define angular bands rotating on the side surfaces. The surface proportion of the aero elements to the surface of an angular band is larger than 5% and less than 25%.

A wheel component for sports and racing bicycles with an annular tire and a central tread surface, which in proper use in straight-ahead travel on a plane ground circumferentially makes contact with the surface of the ground, and which opens up a central longitudinal sectional plane. Planar aero elements are configured on the surface of the annular tire, laterally spaced apart from the longitudinal sectional plane. The aero elements are configured as depressions in the surface of the tire and are disposed on the side surfaces and define angular bands rotating on the side surfaces. The surface proportion of the aero elements to the surface of an angular band is larger than 5% and less than 25%.

A pneumatic radial tire for passenger vehicles of the present disclosure includes a carcass toroidally spanning between a pair of bead portions and including plies of radially arranged cords. A sectional width SW and an outer diameter OD of the tire satisfy a predetermined relational expression. At least one noise reducer is provided on an inner surface of the tire. A ratio L (mm)/S (mm.sup.2) is in a range from 0.02 to 1.5, where L (mm) denotes a circumferential length of the noise reducer and S (mm.sup.2) denotes a cross-sectional area of the noise reducer.

A pneumatic radial tire for passenger vehicles of the present disclosure includes a carcass toroidally spanning between a pair of bead portions and including plies of radially arranged cords. A sectional width SW and an outer diameter OD of the tire satisfy a predetermined relational expression. At least one noise reducer is provided on an inner surface of the tire. A ratio L (mm)/S (mm.sup.2) is in a range from 0.02 to 1.5, where L (mm) denotes a circumferential length of the noise reducer and S (mm.sup.2) denotes a cross-sectional area of the noise reducer.

An outer diameter of a pneumatic tire 350 mm or more and 600 mm or less. As RW is defined by a rim width of a rim wheel assembled to the pneumatic tire and SW is defined by a tire width of the pneumatic tire, the relation of 0.78≤RW/SW≤0.99 is satisfied. A carcass has a carcass cord arranged along the tire width direction. The carcass cord is formed of a filament of steel. The outer diameter of the carcass cords is 0.7 mm or less, and a distance between adjacent carcass cords is 4.0 mm or less.

An outer diameter of a pneumatic tire 350 mm or more and 600 mm or less. As RW is defined by a rim width of a rim wheel assembled to the pneumatic tire and SW is defined by a tire width of the pneumatic tire, the relation of 0.78≤RW/SW≤0.99 is satisfied. A carcass has a carcass cord arranged along the tire width direction. The carcass cord is formed of a filament of steel. The outer diameter of the carcass cords is 0.7 mm or less, and a distance between adjacent carcass cords is 4.0 mm or less.

In a pneumatic tire are defined: a first imaginary line VL1 passing through a ground contact surface in a meridian cross section of a tread, a second imaginary line VL2 passing through a bottom of a shoulder groove and parallel to VL1, an intersection point P between VL2 and a surface of a shoulder land outward of a ground contact edge T in a lateral direction, and an equatorial plane CL. Given A as a distance in the lateral direction between P and CL, B as a groove depth of the shoulder groove, and C as a distance in the lateral direction between T and CL, 0.80≤(B+C)/A≤1.15 is satisfied. Given Q as a distance in the lateral direction between CL and an end of a belt ply that has a shorter dimension in the lateral direction, 0.75≤Q/C≤0.95 is satisfied.

In a pneumatic tire are defined: a first imaginary line VL1 passing through a ground contact surface in a meridian cross section of a tread, a second imaginary line VL2 passing through a bottom of a shoulder groove and parallel to VL1, an intersection point P between VL2 and a surface of a shoulder land outward of a ground contact edge T in a lateral direction, and an equatorial plane CL. Given A as a distance in the lateral direction between P and CL, B as a groove depth of the shoulder groove, and C as a distance in the lateral direction between T and CL, 0.80≤(B+C)/A≤1.15 is satisfied. Given Q as a distance in the lateral direction between CL and an end of a belt ply that has a shorter dimension in the lateral direction, 0.75≤Q/C≤0.95 is satisfied.

An outer diameter of the pneumatic tire is 350 mm or more and 600 mm or less, and as RW is defined by a rim width of a rim wheel assembled to the pneumatic tire and SW is defined by a tire width of the pneumatic tire, the relation of 0.78≤RW/SW≤0.99 is satisfied, and at least two circumferential main grooves extending to the tire circumferential direction are formed in the tread. The circumferential main groove is formed closer to a tire equatorial line than an outer end in the tire width direction of the belt layer.