A tyre for a motorcycle includes a tread portion. The tread portion includes a crown longitudinal groove extending in a tyre circumferential direction on a side of a tyre equator, a shoulder longitudinal groove extending in the tyre circumferential direction on a side of a first tread edge, and a middle groove arranged between the crown longitudinal groove and the shoulder longitudinal groove. The middle groove includes a plurality of middle main groove portions arranged in the tyre circumferential direction and each protruding toward the tyre equator or the first tread edge. Each of the middle main groove portions is formed in a bent line shape or in an arc shape. Each of the middle main groove portions includes a shallow bottom portion having a groove depth smaller than a maximum groove depth of the shoulder longitudinal groove and a maximum groove depth of the crown longitudinal groove.

Provided are a sliding elastic body capable of imparting excellent sliding properties and resistance to protein adsorption and, at the same time, maintaining sealing properties; and a syringe gasket, a catheter, and a tire which include the sliding elastic body. The present invention relates to a sliding elastic body including an elastic body whose surface is fully or partially laminated with a fluororesin film, the laminated elastic body being treated with a fluorinated oil.

In a tire, a shape index of a reference ground contact surface is not less than 1.20 and not greater than 1.50. In the tire, a tread includes a cap layer, an intermediate layer formed such that a loss tangent of the intermediate layer at 30° C. is less than a loss tangent of the cap layer at 30° C. and a base layer formed such that a loss tangent of the base layer at 30° C. is less than the loss tangent of the intermediate layer at 30° C. In the radial direction, the intermediate layer is disposed outwardly of the base layer and the cap layer is disposed outwardly of the intermediate layer. In a shoulder land portion of the tread, a thickness of the cap layer at a center of an axial width is less than a thickness of the cap layer on the shoulder circumferential groove side.

A tire includes a first circumferential main groove 11 and a second circumferential main groove 12 in a tread surface 1. A resonator 21 is formed in an intermediate land portion 20 partitioned between the first circumferential main groove and the second circumferential main groove. The resonator has an auxiliary groove 211 whose both ends terminate within the intermediate land portion. The groove depths D1 of the first and second circumferential main grooves are 50% or less of the groove widths W2 of the first and second circumferential main grooves, respectively. The groove depth D3 of the auxiliary groove of the resonator is 70% or more of the groove depth D1 of the first circumferential main groove.

It is an object to provide a tire having an excellent balance of wet grip performance and chipping resistance. The tire is a tire comprising a tread, wherein the tread has a lateral groove neither of both ends of which opens into circumferential grooves, wherein a predetermined rubber component, a predetermined filler, and a silane coupling agent are compounded in a rubber layer of a tread surface, wherein a brittleness temperature of the rubber component and a ratio of a groove depth at the deepest part of the groove bottom of the lateral groove neither of both ends of which opens into the circumferential grooves to a thickness of the entire tread are made to lie in predetermined ranges.

A pneumatic tire includes: a plurality of shoulder blocks that are provided in a side portion, defined by a shoulder main groove extending in a tire circumferential direction and a shoulder lateral groove extending in a tire width direction, and disposed side by side in the tire circumferential direction; a rib that is provided in the side portion, and extends in the tire circumferential direction along the shoulder blocks; and a projection that is provided in the side portion, and extends from the rib toward the shoulder blocks.

A pneumatic tire comprises a tread portion provided with a pair of crown main grooves and a pair shoulder main grooves to divide middle portions and shoulder portions, the tread portion having a contact surface covered with a cap rubber layer with a loss tangent of from 0.03 to 0.18, the middle portions provided with only middle lug grooves with groove widths within 2 mm, each middle lug groove extending from one end connected either the crown or shoulder main groove to the other end terminating within the middle portion, the middle lug grooves having an angle of from 40 to 55 degrees with respect to a tire circumferential direction, and each shoulder portion provided with first shoulder lateral grooves having axially inner ends connected to the shoulder main groove, wherein first shoulder lateral grooves consist of grooves having groove widths within 2 mm.

A pneumatic tire (10) has, in the surface of the tread (11), a central circumferential groove (12) located at the center of the contact patch width and extending circumferentially around the tire, a plurality of longitudinal grooves (13 (13a, 13b)) formed on the axially outside of the central circumferential groove (12), lug grooves (15), and blocks (16 (16a to 16c)) defined by the central circumferential groove (12), the longitudinal grooves (13), and the lug grooves (15). Each of the lug grooves (15) is formed such that its width in the shoulder region is greater than its width in the central region, and the sum of the groove area of the central circumferential groove (12) and the groove area of the longitudinal grooves (13) is smaller than the area of the lug grooves (15). As a result, the pneumatic tire (10) not only secures the wet braking performance and wear resistance performance on paved roads, but also improves the acceleration performance and braking performance and the steering stability performance on snowy roads.

A tire having high on-ice starting performance, the tire is provided with a plurality of circumferential direction grooves formed on a tread of the tire and extending in a tire circumferential direction, a plurality of width direction grooves extending in a direction intersecting the tire circumferential direction, a plurality of blocks demarcated by the circumferential direction grooves and the width direction grooves, and a plurality of width direction sipes formed on surfaces of the blocks and extending in the direction intersecting the tire circumferential direction, in which a distance P between the sipes 18z is set in a range of 4-12 mm.

A pneumatic tire is provided that improves braking performance on ice, turning performance on ice, and water drainage performance in a well-balanced manner. A plurality of small blocks each having a contour consisting of four line segments is arranged while curving in a tire width direction to form medium blocks. The medium blocks are arranged in a plurality of rows in a tire circumferential direction to form large blocks. The large blocks are formed adjacent to the circumferential main groove in the tire circumferential direction on both sides in the tire width direction across the circumferential main groove.