Pirelli Tyre S.p.a.

Pirelli Pneumatici S.p.a.

Luca Bruschelli

Mario Mariani

Pierangelo Misani

Andrea Schiavolin

Guido Luigi Daghini

Diego Tirelli

Giuliano Bonaccorsi

Aline Ringis Pin

Francesco Gagliardi

Silvio Montanari

Sandro Gallo

Emiliano Resmini

Matteo Torchiana

Lisa Grassi

Daniele Matturro

Alessandro Monzani

Misani Pierangelo

Luca Miragliotta

Vinicius Pecorari Coelho

Rocco Parente

Roberta Giambelli

A motorcycle tyre () has a tread band () comprising a plurality of grooves that form at least part of a tread pattern including a module (T) replicated along a circumferential direction and having a predetermined circumferential length (C). The module (T) comprises a pair of circumferential grooves () arranged on opposite sides with respect to the equatorial plane (X-X) of the tyre (). Such circumferential grooves () extend along the circumferential direction for at least part of said predetermined circumferential length (C) and define between them a central annular portion (A) of tread band () having a void to solid ratio substantially equal to zero and a predetermined axial width (A). The module (T) further comprises a pair of first lateral annular portions (B) arranged on opposite sides with respect to the equatorial plane (X-X) in an axially outer position with respect to said pair of circumferential grooves () and each having a void to solid ratio substantially equal to zero, and a plurality of transversal grooves () arranged on opposite sides with respect to the equatorial plane (X-X), in an axially outer position with respect to said pair of first lateral annular portions (B). The tyre () has a curvature ratio lower than about 0.4.

Motorcycles tyre

A motorcycle tyre has a tread band () comprising a plurality of grooves that form a tread pattern including a module (T) replicated along a circumferential direction of the tyre () and having a predetermined circumferential length (C). The module (T) comprises a pair of circumferential grooves () arranged on opposite sides with respect to the equatorial plane (X-X) of the tyre (). Such circumferential grooves () extend along the circumferential direction of the tyre () for only part of said predetermined circumferential length (C) and define between them a central portion (A) of tread band () having a void to solid ratio substantially equal to zero and a predetermined axial width (A). The module (T) further comprises a plurality of transversal grooves () arranged on opposite sides with respect to the equatorial plane (X-X) at a distance from said equatorial plane (X-X) greater than that of said circumferential grooves () and a pair of first lateral annular portions (B) axially arranged between said circumferential grooves () and said plurality of pairs of transversal grooves (), each of said first lateral annular portions (B) comprising, in a position axially adjacent to the respective circumferential groove (), a respective part (B) of tread band having a circumferential length at least equal to that of said circumferential grooves () and a void to solid ratio substantially equal to zero. The tyre () has a curvature ratio lower than about 0.32.

It is described a motorcycle tyre () intended to be fitted to a wheel of a motorcycle of the 'supersport' segment, comprising an equatorial plane and a tread band extending in axial direction with a given axial development, wherein the tread band comprises a first annular portion made of a first elastomeric material, having a first dynamic shear storage modulus measured at 70° C., and at least one second annular portion made of a second elastomeric material, having a second dynamic shear storage modulus measured at 70° C., different form said first dynamic shear storage modulus measured at 70° C.

Motorcycle tyre

Motorcycle tire

A motorcycle tyre intended to be fitted to the rear wheel of a motorcycle. The motorcycle tyre has a tread pattern with a high void-to-rubber ratio that provides a suitable draining. The tread pattern has pairs of primary grooves to carry out the draining function of the tyre, and arranged substantially according to the stress lines of the tyres to reduce the probability of triggering uneven wear. Also included are secondary grooves having a reduced dimension, in terms of both extension and width, arranged between the primary grooves to increase the grip of the tyre to the ground. Orientation of the secondary grooves increases stabilizing features against drift forces acting on the tyre, particularly in low or very low friction conditions.

Tyre for motorcycle wheels

A tyre that can be fitted to the front of a motorcycle. The tyre has a high void-to-rubber ratio and includes grooves located asymmetrically across the equatorial plane of the tyre, arranged substantially orthogonally to the equatorial plane of the tyre at the equatorial plane itself. According to one aspect, the grooves are close to one another in the circumferential direction of the tyre to increase their number in a footprint area of the tyre.

Tyre for motorcyle wheels

A motorcycle tyre with a low void-to-rubber ratio while providing a stiffness suitable for good performance on dry ground and on track. A tread band with grooves is arranged to provide a draining effect without structurally weakening the tread band. According to one aspect, the tread band has a tread pattern with two pairs of grooves having segments or portions that produce a warming effect when the compound of the tread band is cold. The tread band provides grip to the ground and limited local warming when the compound of the tread band is at the operating temperature or when driving on dry ground, to provide stiffness and readiness of response.

Pneumatic tire

A tyre for motor vehicles, includes: a carcass structure; a belt structure applied in a position radially external to the carcass structure and a tread band; the tyre having a transverse curvature ratio of at least about 0.30, the carcass structure including at least one carcass layer including textile reinforcement elements obtained by means of cords having, in a load/elongation diagram, an elastic response of at least 55 N at an elongation of about 2%; and at least one tread portion comprising a cured elastomeric material obtained by curing an elastomeric compound including 100 phr of at least one elastomeric polymer, from 30 to 130 phr of at least one reinforcement filler including at least 60% of an inorganic material selected from among silica, alumina, silicates, hydrotalcite, calcium carbonate, kaolin, titanium dioxide and their mixtures, and from 1 to 35 phr of at least one resin.

Tyre for motorcycles

Front tire

Rear tire

Tire

A tire for motorcycles, having a tread band includes a central annular portion, two lateral annular portions and two shoulder annular portions. The axial extension of these portions is not greater than 25%, 35%, and 20% of the axial development of the tread band, respectively. The tread band includes a module repeated along the circumference of the tire in which at least two substantially longitudinal grooves, mainly extending in the lateral annular portions, include, moving axially away from the equatorial plane of the tire, at least three substantially straight and substantially consecutive segments, wherein the first segment forms an angle with respect to the equatorial plane greater than 150&#xb0;; and the second segment has a length measured along its extension smaller than the length of the first segment.

Motorcycle tire suitable for mounting on the rear wheel of a motorcycle, including a tread band having a tread pattern includes a module which is repeated in a direction of circumferential extension of the tire, the module having: at least two substantially longitudinal first grooves which are inclined opposite to each other with respect to the equatorial plane of the tire; and at least two substantially longitudinal second grooves which are inclined opposite to each other with respect to the equatorial plane. Each substantially longitudinal first groove alternates with a second longitudinal groove. The substantially longitudinal first grooves have, in a direction axially away from the equatorial plane of the tire, two substantially consecutive curvilinear sections, the first section of which has a convexity and the second section of which has a concavity directed in the rolling direction of the tire. The first curvilinear section defines along its extension with the equatorial plane angles smaller than or equal to 90&#xb0;.

Growing community of inventors

Milan, Italy

Luca Bruschelli