Adapter for a rolling assembly, of axis of rotation X-X′, comprising a tire (2), a rim (3), and an adapter (100), said adapter comprising an axially inner end (10), an axially outer end (11) and a body (12), wherein said axially outer end comprises an outer reinforcing element (15) which is a structure substantially of revolution about the axis X-X′ comprising a plurality of windings of at least one wire that are arranged axially beside one another over several layers radially superposed on one another. The section of the outer reinforcement (15) has a ratio of moments of inertia Ix/Iy of greater than 1.3 for an axial width of between 6 and 9 mm, where Ix is the moment of inertia around a first axis passing through its centre of gravity and parallel to the axis of rotation X-X′, and Iy is the moment of inertia around a second axis passing through its centre of gravity and perpendicular to the first axis.

An adapter, for a rolling assembly having an axis of rotation and comprising a tyre (P) having two beads (B), and a rim (J), provides the connection between one of the beads (B) and the rim (J), the said rim having two rim seats (7), the said adapter having an axially inner end (10) intended to be mounted on the rim seat (7) and comprising an inner reinforcing element (16), the said reinforcing element (16) having a centre C.sub.2, an axially outer end (9) comprising an outer reinforcing element (15), the said reinforcing element (15) having a centre C.sub.1, a body (11) that connects the said outer end (9) to the said inner end (10) so as to form a single piece and comprises at least one main reinforcement that provides the connection between the said outer reinforcer and the said inner reinforcer, and comprises a first end (17A) and a second end (17B), a substantially cylindrical adapter seat (18) intended to receive one of the said beads (B), the said seat (18) being situated at the axially outer end (9) of the said body (11), an adapter bearing face (21) substantially contained in a plane perpendicular to the axis of rotation, the said bearing face being situated on the axially inner face of the axially outer end (9), and an overall length L and a length LT measured between the centres C.sub.1 and C.sub.2. The first end (17A) and the second end (17B) of the reinforcement are arranged one upon the other so as to form an overlap.

With a pneumatic tire not mounted on a rim, in a meridian cross-section a first line is parallel with an innermost bottom side of a bead core in a radial direction and passes through an outermost projection of the bead core in a lateral direction, a second line is orthogonal with the first line at the outermost projection, a third line is orthogonal with the first line and passes through an intersection of a rim cushion rubber, a distance between the second and third lines is 2.0 to 4.0 mm, a shortest distance between an innermost projection of the bead core in the lateral direction and a cord of a carcass layer is 0.6 to 1.4 mm, and a shortest distance between an innermost end of the bottom side of the bead core in the lateral direction and the cord of the carcass layer is 1.2 to 2.2 mm.

With a pneumatic tire not mounted on a rim, in a meridian cross-section a first line is parallel with an innermost bottom side of a bead core in a radial direction and passes through an outermost projection of the bead core in a lateral direction, a second line is orthogonal with the first line at the outermost projection, a third line is orthogonal with the first line and passes through an intersection of a rim cushion rubber, a distance between the second and third lines is 2.0 to 4.0 mm, a shortest distance between an innermost projection of the bead core in the lateral direction and a cord of a carcass layer is 0.6 to 1.4 mm, and a shortest distance between an innermost end of the bottom side of the bead core in the lateral direction and the cord of the carcass layer is 1.2 to 2.2 mm.

A pneumatic tire to be combined with a rim is proposed. The tire may include a bead for preventing the pneumatic tire from coming off the rim. The tire may also include an apex configured to absorb an impact applied to the bead. The tire may further include a carcass extending to surround a portion of the apex and including a steel cord. The carcass may include a first carcass end portion disposed closer to one end of both ends of the apex in a radial direction of the pneumatic tire which is connected to the bead than the other end of the apex spaced apart from the bead.

A pneumatic tire to be combined with a rim is proposed. The tire may include a bead for preventing the pneumatic tire from coming off the rim. The tire may also include an apex configured to absorb an impact applied to the bead. The tire may further include a carcass extending to surround a portion of the apex and including a steel cord. The carcass may include a first carcass end portion disposed closer to one end of both ends of the apex in a radial direction of the pneumatic tire which is connected to the bead than the other end of the apex spaced apart from the bead.

A flexible adapter (1) for a rolling assembly, said rolling assembly comprising a tyre (2) having two beads (21), a rim (3) and two adapters (1) each intended to ensure the joint between one of the beads (21) and the rim (3), said rim (3) having two rim seats (31) each extended axially outwards by a rim flange (32), the rim seat having a diameter D3, the adapter comprising an axially outer end (11) and a body (12) oriented substantially axially and disposed between said axially outer end (11) and said axially inner end (10), said body (12) having a radially outer face (121) and a radially inner face (122), having the intersection between the shoulder (111) of the axially outer end (11) of the adapter (1) and the substantially tapered face of said adapter seat (13) forming a circle of diameter D1, said adapter seat (13) having a substantially tapered face of angle α, in which the difference “d” between the diameters D1 and D3, d=D1−D3, lies between 25.9 mm and 30.4 mm and the angle α is greater than 0.5°.

An improved clamping mechanism to secure a tire between a bead ring and a wheel utilizing a bolt is provided. The bolt has a ball seat that pivots within an enlarged pilot hole in the bead ring as the bolt threads engage in threaded section of the wheel, pulling the bead ring toward the wheel. As the bead ring is tightened upon the wheel, eventually the bead ring contacts a fulcrum on the wheel, at which point the outer edge of the bead ring is leveraged against the tire bead bundle and pressing down the tire bead to lock it in place against the wheel. As the bead ring can pivot within the enlarged pilot hole around the bolt, the bolt is not stressed. Further, the wheel comprising a safety bead and non-skid coating on the inner wall of the wheel to prevent the wheel sliding around the wheel.

A motorcycle tire comprises a pair of bead portions each with a bead core therein and a bead bottom surface. In a non-rim assembled state in which the bead portions are held such that the axial distance between the axially outer surfaces of the bead portions matches the rim width of a regular rim, a conditional expression: 0.99 =< Dc/(Dr+2T) =< 1.00, is satisfied, wherein “Dc” is the inner diameter of the bead core at the axial center position of the bead core, “Dr” is the rim diameter of the regular rim, and “T” is the radial distance from the inner surface of the bead core to the bead bottom surface at the axial center position.

Provided is a motorcycle tire 2 that can enhance a stiffness feeling while suppressing deterioration of a ground-contact feeling. A bead portion TB of the tire 2 includes a core 18. An outer surface of the bead portion TB includes a seat surface 24, a flange surface 26, and a heel surface 28. An inner diameter dw of the core 18, a rim diameter D, an inner diameter dA of the tire 2 at a heel reference point PH, and an inner diameter dB of the tire 2 at the seat reference point PS satisfy the following formulas.

dw/D≥1.0041

dA/D≤0.9966

dA−1.72≤dB≤dA−0.73