A protector shield for a sidewall of a motor vehicle tire, and to a wheel assembly for a motor vehicle incorporating this protector shield is provided. This protector annular shield is configured to be mounted on a wheel rim receiving said tire. The protector shield includes at least two concentric shield rings having a first shield ring and a second shield ring which are axially juxtaposed and which respectively include, substantially arranged end to end in a circumferential direction, a plurality of first arcuate sectors and a plurality of second arcuate sectors which angularly overlap each other, so that every two consecutive second sectors are substantially arranged end to end axially in front of a first sector short of both ends of this first sector.

A process for manufacturing a bicycle wheel component, comprising the steps of providing a component having at least one braking area that cooperates with a braking body made by molding of composite material having structural fibers in a polymeric material, and post-molding machining of at least one region of the braking area by removing only polymeric material, without removal of the structural fiber, from the entire region so that the structural fiber outcrops at least in part from the polymeric material, and removing the structural fiber and possibly the polymeric material according to at least one groove within the region. A bicycle wheel component having a braking area of composite material, wherein in a region of the braking area, the structural fiber outcrops at least from the polymeric material, and the region comprises a groove through the structural fiber and possibly the polymeric material of the composite material.

Provided is a device for determining a wheel fastening state that allows a wheel fastening state to be monitored during running. The device includes a sensor unit (3) that is attachable to and detachable from a wheel fastening part, an information terminal (4) that is an in-vehicle device (4A) or a portable terminal (4B), and a server (30). The terminal (4) includes a measurement instruction module (23) to read vehicle state data from a control and communication system (5) of a vehicle and send an instruction for to measurement to the sensor unit (3) at determined timing. The server (30) includes a first information processing module (32) configured to determine an abnormality of a fastening state of the wheel fastening part by comparing the measurement data with accumulated data that is measured under the same condition and stored in the past.

The purpose of the present invention is to minimize decline in endurance, while improving vibration performance. The spokes of an airless tire are provided, as an integrated unit, with an outside annular portion joined to the inside peripheral surface of a tread ring, an inside annular portion joined to the outside peripheral surface of a hub, and a spoke plate portion of constant thickness providing linkage therebetween. The radial inner edge and the radial outer edge of the center plane of thickness of the spoke plate portion are respectively diagonal with respect to a tire axial-direction line. The intersection line at which the center plane of thickness intersects a plane that is at a right angle to the tire axial-direction line constitutes a straight line. The spoke length, which is the length from the radial inner edge to the radial outer edge along the intersection line, is constant for any given location in the tire axial direction.

A process for manufacturing a bicycle wheel component, comprising the steps of providing a component having at least one braking area that cooperates with a braking body made by molding of composite material having structural fibers in a polymeric material, and post-molding machining of at least one region of the braking area by removing only polymeric material, without removal of the structural fiber, from the entire region so that the structural fiber outcrops at least in part from the polymeric material, and removing the structural fiber and possibly the polymeric material according to at least one groove within the region. A bicycle wheel component having a braking area of composite material, wherein in a region of the braking area, the structural fiber outcrops at least from the polymeric material, and the region comprises a groove through the structural fiber and possibly the polymeric material of the composite material.

A spoke has a carbon rod and at least one connecting unit. The carbon rod is made of a composite material containing thermoplastic resin and carbon fibers and has at least one blocking portion. Each one of the at least one connecting unit has a tube mounted on and around the carbon rod and blocked by a corresponding one of the at least one blocking portion. The carbon rod is heated and shaped to form the blocking portion. The spoke in accordance with the present invention blocks the connecting unit by the blocking portion to promote a connection stability of the spoke.

Disclosed is a wheel having a sphere at the hub of the rim which can rotate in all directions by the ball bearing it is supported by, wherein the sphere is produced from various metals, carbon fibre, etc. material. The wheel helps to prevent vehicles from skidding off tracks at turns even at high speeds or to prevent accidents that may occur as a result of swiping of vehicles with each other particularly during competitive racing.

A non-pneumatic tire (1) of the present invention includes an attachment body (11) attached to an axle, a ring-shaped body (13) which surrounds the attachment body (11) from the outside in a tire radial direction, and coupling members (15) which displaceably couple the attachment body (11) to the ring-shaped body (13), wherein a plurality of coupling members (15) are arranged in a tire circumferential direction and include elastic coupling plates (21 and 22) whose opposite ends are respectively coupled to the attachment body (11) and the ring-shaped body (13), and a bending rigidity EI1 of the elastic coupling plates (21 and 22) represented by E1W1t1.sup.3/12 when the average thickness in the tire circumferential direction is t1 (mm), the average width in a tire width direction H is W1 (mm), and the Young's modulus is E1 (MPa) is smaller than the bending rigidity EI2 of the ring-shaped body (13) represented by E2W2t2.sup.3/12 when the average thickness in the tire radial direction is t2 (mm), the average width in the tire width direction H is W2 (mm), and the Young's modulus is E2 (MPa).

A bicycle hub assembly comprises a hub axle, a hub shell, a sprocket support body, a first ratchet member, a second ratchet member, and a sliding member. The hub shell includes at least one first tooth. The sprocket support body includes a first helical spline. The first ratchet member comprises at least one first ratchet tooth and a second helical spline engaged with the first helical spline. The second ratchet member comprises at least one second ratchet tooth and at least one second tooth. The at least one second ratchet tooth is engageable with the at least one first ratchet tooth. The at least one second tooth is engaged with the at least one first tooth. The sliding member is provided between the sprocket support body and the second ratchet member in an axial direction parallel to a rotational axis. The sliding member includes a non-metallic material.

A damper of the present invention includes: a damping portion that exerts a damping force by using a granular material at a time of extension and contraction; and an elastic portion that exerts an elastic force at the time of extension and contraction, wherein the damping portion is coupled to the elastic portion such that the damping force and the elastic force are exerted in parallel.