US 12,030,347 B2
Motorcycle tire set
Kenji Nonaka, Kobe (JP)
Assigned to SUMITOMO RUBBER INDUSTRIES, LTD., Kobe (JP)
Filed by Sumitomo Rubber Industries, Ltd., Kobe (JP)
Filed on Jan. 13, 2023, as Appl. No. 18/096,821.
Claims priority of application No. 2022-029739 (JP), filed on Feb. 28, 2022; and application No. 2022-162541 (JP), filed on Oct. 7, 2022.
Prior Publication US 2023/0271461 A1, Aug. 31, 2023
Int. Cl. B60C 19/00 (2006.01); B60C 9/02 (2006.01); B60C 9/04 (2006.01); B60C 9/06 (2006.01); B60C 11/00 (2006.01)
CPC B60C 19/001 (2013.01) [B60C 9/023 (2013.01); B60C 9/0238 (2013.01); B60C 9/04 (2013.01); B60C 9/06 (2013.01); B60C 11/0058 (2013.01); B60C 2009/0276 (2013.01); B60C 2011/0016 (2013.01); B60C 2200/10 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A motorcycle tire set comprising:
a front-wheel tire; and
a rear-wheel tire,
wherein
each of the front-wheel tire and the rear-wheel tire comprises a tread portion, a toroidal carcass, a band layer arranged outwardly in a tire radial direction of the carcass in the tread portion, and a tread rubber arranged outwardly in the tire radial direction of the band layer,
the carcass comprises a carcass ply comprising a plurality of carcass cords,
the band layer comprises a jointless band ply in which a band cord is wound spirally in a tire circumferential direction at an angle equal to or less than 5 degrees, and
the tread rubber comprises an outer surface between tread edges,
the outer surface of the tread rubber consists of
a crown rubber portion formed of a rubber material and disposed in a tread crown region so as to cross a tire equator, and
a pair of shoulder rubber portions formed of a rubber material different from the rubber material of the crown rubber portion and each extending in a tire axial direction from the crown rubber portion to a respective one of the tread edges,
wherein
an angle θ1 of the plurality of carcass cords of the front-wheel tire is equal to or less than 65 degrees with respect to the tire circumferential direction,
a rubber hardness Hc2 of the crown rubber portion of the rear-wheel tire is greater than a rubber hardness Hc1 of the crown rubber portion of the front-wheel tire,
in the front-wheel tire, the rubber hardness Hc1 of the crown rubber portion is greater than a rubber hardness Hs1 of the pair of shoulder rubber portions,
in the rear-wheel tire, a rubber hardness Hs2 of the pair of shoulder rubber portions is greater than the rubber hardness Hc2 of the crown rubber portion, and
the rubber hardness Hc1 of the crown rubber portion of the front-wheel tire ranges from 58 to 68.