| 摘要 |
<p>A pneumatic tire for a cycle wheel comprising a casing and two beads positioned on respective ones of lateral sides of the casing, the pneumatic tire having the shape of an open torus and defining an inner volume, at least one of the two beads having a shoulder projecting outward of the portion of the casing adjacent thereto, and a support positioned along a radial plane at a second end of the bead, the shoulder being positioned along a radial plane at a first end of the bead and comprising, on its outer surface, a first support surface and an edge, the first support surface being positioned between the edge and the casing, and the support surface being set back with respect to the edge. In a radial plane, the normal direction of the first support surface is substantially tangent to the casing, the support comprising a second support surface positioned on the inner side. The longitudinal modulus of the bead, or the equivalent modulus of the various constituent elements of the bead, is less than 2000 Mpa, and the transverse modulus of the bead, or the equivalent modulus of the various constituent elements of the bead, is greater than 50 Mpa or greater than 100 MPa.</p> |
