A tire with a treads depth measuring device that includes a first electrode and a second electrode that are fixed to internal surface of the tire, and an oscillator that is electrically connected to the electrodes so that capacitance between the electrodes affects frequencies of the oscillator. Changes in frequencies of the oscillator can be used to detect and calculate changes in thickness of the tire and changes in depth of treads in the tire.

A tire with a treads depth measuring device that includes a first electrode and a second electrode that are fixed to internal surface of the tire, and an oscillator that is electrically connected to the electrodes so that capacitance between the electrodes affects frequencies of the oscillator. Changes in frequencies of the oscillator can be used to detect and calculate changes in thickness of the tire and changes in depth of treads in the tire.

A method for obtaining the distance travelled by a tire comprises fixing a sensor, to the right of the crown with a radial position Rc, capable of generating a signal proportional to the acceleration experienced; rolling the tire at a rotation speed W, subject to a load Z; acquiring, after a time T, a first signal Sig.sup.i comprising the acceleration amplitude in the direction normal to the crown, wherein the values below a threshold N represent less than 40 percent of the length of the first signal; identifying a reference value V.sub.i.sup.reference, being the square root of the average value of the first signal Sig.sup.i; and determining the distance travelled D during the time T from the following formula: D=A*T*V.sub.i.sup.reference, where A is proportional to the square root of the rolling radius of the tire.

A method for obtaining the distance travelled by a tire comprises fixing a sensor, to the right of the crown with a radial position Rc, capable of generating a signal proportional to the acceleration experienced; rolling the tire at a rotation speed W, subject to a load Z; acquiring, after a time T, a first signal Sig.sup.i comprising the acceleration amplitude in the direction normal to the crown, wherein the values below a threshold N represent less than 40 percent of the length of the first signal; identifying a reference value V.sub.i.sup.reference, being the square root of the average value of the first signal Sig.sup.i; and determining the distance travelled D during the time T from the following formula: D=A*T*V.sub.i.sup.reference, where A is proportional to the square root of the rolling radius of the tire.

A cavity noise reduction tire is proposed. The tire may include an inner liner disposed inside a tire. The tire may also include a sound absorbing part attached to at least a portion of a surface of the inner liner and extending in a first direction parallel to a circumferential direction of the tire. The tire may also include an adhesive part serving to adhere the sound absorbing part to the surface of the inner liner. At least a portion of the adhesive part may extend along a portion adjacent to an edge of the sound absorbing part.

In a first aspect of the invention, the invention is directed to a pneumatic tire comprising two spaced apart bead portions, a tread portion, a pair of sidewalls extending radially inward from axially outer edges of the tread portion to join the respective bead portions, the axially outer edges of the tread portion defining a tread width, a carcass, an innerliner covering the carcass and defining a tire cavity, and multiple layers of foam strip material attached on top of each other to the innerliner within the tire cavity in an area radially below the tread portion, wherein at least two of the layers are interlocked to each other along their length so as to hold the layers together in a radial direction.

Described herein are systems and methods for determination of rolling resistance from a sensor or sensors in a tire or tires for application in smart cars to provide feedback to interested parties, such as Departments of Transportation or tire manufacturers.

Described herein are systems and methods for determination of rolling resistance from a sensor or sensors in a tire or tires for application in smart cars to provide feedback to interested parties, such as Departments of Transportation or tire manufacturers.

A tire has a material diffusion barrier, and a method produces the same. In an embodiment, a method for producing a material diffusion barrier on a tire comprises exposing a surface of the tire to a cationic solution to produce a cationic layer on the surface. The method further comprises exposing the cationic layer to an anionic solution to produce an anionic layer on the cationic layer, wherein a layer comprises the cationic layer and the anionic layer. The layer comprises the material diffusion barrier.

A tire has a material diffusion barrier, and a method produces the same. In an embodiment, a method for producing a material diffusion barrier on a tire comprises exposing a surface of the tire to a cationic solution to produce a cationic layer on the surface. The method further comprises exposing the cationic layer to an anionic solution to produce an anionic layer on the cationic layer, wherein a layer comprises the cationic layer and the anionic layer. The layer comprises the material diffusion barrier.