Provided is a pneumatic tire including, on an outer surface of its sidewall portion, a decorative portion including a print layer and inner and outer layers respectively disposed on tire inner and outer sides of the print layer. When storage moduli at 25° C. of the print, inner, and outer layers are respectively defined as E1.sub.25′, E2.sub.25′, and E3.sub.25′, E1.sub.25′<E2.sub.25′ and E1.sub.25′<E3.sub.25′ are satisfied. When storage moduli at 80° C. of the print, inner, and outer layers are respectively defined as E1.sub.80′, E2.sub.80′, and E3.sub.80′, and storage modulus variations α1, α2, and α3 at high temperature of the print, inner, and outer layers are respectively defined as α1=|E1.sub.25′−E1.sub.80′|/E1.sub.25′, α2=|E2.sub.25′−E2.sub.80′|/E2.sub.25′, and α3=|E3.sub.25′−E3.sub.80′|/E3.sub.25′, α1<α2 and α1<α3, and E2.sub.25′>E2.sub.80′ and E3.sub.25′>E3.sub.80′ are satisfied.

In a pneumatic tire, a carcass layer is between bead portions, a bead core is in each bead portion, a reinforcement layer is on an outer side of the carcass layer, and a tread rubber layer is on the outer side of the reinforcement layer. A pair of first boundary lines passes through an intersection of an extension of a side arc forming a tread profile and an extension of a shoulder arc and orthogonal to a tire inner surface, a pair of second boundary lines passes through a rim check line and orthogonal to the tire inner surface, first to third regions are defined which have cross sectional areas of SA, SB, and SC, respectively, and the first to third regions respectively have lengths of a, b, and c along the tire inner surface such that 7.5≤SA/a≤11.5 and 2.0≤SB/b≤6.0 are satisfied.

In a pneumatic tire, a carcass layer is between bead portions, a bead core is in each bead portion, a reinforcement layer is on an outer side of the carcass layer, and a tread rubber layer is on the outer side of the reinforcement layer. A pair of first boundary lines passes through an intersection of an extension of a side arc forming a tread profile and an extension of a shoulder arc and orthogonal to a tire inner surface, a pair of second boundary lines passes through a rim check line and orthogonal to the tire inner surface, first to third regions are defined which have cross sectional areas of SA, SB, and SC, respectively, and the first to third regions respectively have lengths of a, b, and c along the tire inner surface such that 7.5≤SA/a≤11.5 and 2.0≤SB/b≤6.0 are satisfied.

Tyre, in particular cycle tyre, with a device for generating rotation-dependent signals, a method for producing said tyre and a system for controlling a cycle drive with such a tyre. Tyre, in particular cycle tyre, with a device for generating rotation-dependent signals, in which the device is arranged in the tyre (1, 3) or is connected to the tyre and has a signal-generating element (6, 14), which is held in a retaining element connected positively or non-positively to the tyre body, wherein the receiving element is arranged substantially on the outside of strengthening elements or reinforcing elements of the tyre and the signal-generating element is held in the retaining element in such a way that the signal-generating element forms part of the outer surface of the tyre or protrudes beyond the outer surface of the tyre.

Tyre, in particular cycle tyre, with a device for generating rotation-dependent signals, a method for producing said tyre and a system for controlling a cycle drive with such a tyre. Tyre, in particular cycle tyre, with a device for generating rotation-dependent signals, in which the device is arranged in the tyre (1, 3) or is connected to the tyre and has a signal-generating element (6, 14), which is held in a retaining element connected positively or non-positively to the tyre body, wherein the receiving element is arranged substantially on the outside of strengthening elements or reinforcing elements of the tyre and the signal-generating element is held in the retaining element in such a way that the signal-generating element forms part of the outer surface of the tyre or protrudes beyond the outer surface of the tyre.

In a tire 2 of the present invention, sidewalls 6 each include an outer layer 6a, and an inner layer 6b disposed inward of the outer layer 6a in the axial direction. A loss tangent of the inner layer 6b is less than a loss tangent of the outer layer 6a. When Hr represents a height, in the radial direction, from a bead base line BBL to an outer side end of a rim R, and Hi represents a height, in the radial direction, from the bead base line BBL to an inner side end 46 of the inner layer 6b, a ratio (Hi/Hr) of the height Hi to the height Hr is greater than or equal to 0.0 and not greater than 3.0.

In a tire 2 of the present invention, sidewalls 6 each include an outer layer 6a, and an inner layer 6b disposed inward of the outer layer 6a in the axial direction. A loss tangent of the inner layer 6b is less than a loss tangent of the outer layer 6a. When Hr represents a height, in the radial direction, from a bead base line BBL to an outer side end of a rim R, and Hi represents a height, in the radial direction, from the bead base line BBL to an inner side end 46 of the inner layer 6b, a ratio (Hi/Hr) of the height Hi to the height Hr is greater than or equal to 0.0 and not greater than 3.0.

A heavy-duty pneumatic tire includes a section width being equal to or less than 335 mm, an aspect ratio being equal to or less than 55%, and a toroidal carcass extending between axially spaced bead portions through a tread portion and sidewall portions. The carcass includes a carcass ply which includes a main portion and a turn-up portion turned up around a bead core of each bead portion. A belt layer is disposed radially outward of the carcass in the tread portion, wherein a radially outer end of the turn-up portion is located between the main portion and the belt layer in the tread portion. A sheeted rubber layer is disposed between the main portion and the turn-up portions in each sidewall portion.

A heavy-duty pneumatic tire includes a section width being equal to or less than 335 mm, an aspect ratio being equal to or less than 55%, and a toroidal carcass extending between axially spaced bead portions through a tread portion and sidewall portions. The carcass includes a carcass ply which includes a main portion and a turn-up portion turned up around a bead core of each bead portion. A belt layer is disposed radially outward of the carcass in the tread portion, wherein a radially outer end of the turn-up portion is located between the main portion and the belt layer in the tread portion. A sheeted rubber layer is disposed between the main portion and the turn-up portions in each sidewall portion.

The present invention aims to provide a pneumatic tire with sufficiently reduced rolling resistance. The pneumatic tire according to the present invention including a carcass having a carcass main portion extending from a tread portion via a sidewall portion to a bead portion in a toroidal shape and locked on a bead core embedded in the bead portion, and a belt disposed on a crown portion outer peripheral side of the carcass, characterized in that, when mounted on an applicable rim and put under a predetermined internal pressure no-load condition, a minimum value R1 of a curvature radius of a tire width direction cross-section in a tire radial direction outer portion of the carcass main portion positioned on an tire radial direction outer side than a position where a distance measured from a tire radial direction inner end of the carcass outwardly in the tire radial direction becomes ½ of a carcass cross-sectional height is 0.6 times or less of a minimum value R2 of the curvature radius of the tire width direction cross-section of a portion that, in the tire radial direction inner portion of the carcass main portion positioned on the tire radial direction inner side than the tire radial direction outer portion, bulges out in the tire width direction.