Abstract: A pneumatic motorcycle tire 1 is provided with a tread pattern having an intended tire rotational direction N. The tread portion 2 is provided on each side of the tire equator C with a unit pattern 9 repeatedly arranged in the tire circumferential direction to form the tread pattern. The unit pattern 9 comprises: a first oblique groove 11 extending axially outwardly from a vicinity of the tire equator C and obliquely, while inclining to the rotational direction N; a second oblique groove 12 disposed on the toe-side in the rotational direction N of the first oblique groove 11 and extending therealong; and a narrow oblique groove 15 extending axially outwardly from the axially inner end of the first oblique groove 11 to the axially inner end of the second oblique groove 12, while inclining to the opposite direction to the rotational direction N.
January 29, 2016
Date of Patent:
February 5, 2019
SUMITOMO RUBBER INDUSTRIES, LTD., THE GOODYEAR TIRE & RUBBER COMPANY
Masafumi Otani, Sebastien Willy Fontaine, Armand Rene Gabriel Leconte, Julien Michel Sylvain Seguy, Jean-Luc Faure, Auguste Elichiry
Abstract: A tire for a motorbike can improve turning performance and dry grip performance with good balance. In a tire for a motorbike, a tread part is provided with a first inclined groove and a second inclined groove disposed closer to a tread end than is the first inclined groove. The first inclined groove is provided to a forward-movement grounded area. An inner end of the second inclined groove is provided in an area within a range 2% of a tread expansion radius centered about an end edge of the forward-movement grounded area. An outer end of the second inclined groove is provided to a position displaced from the inner end of the second inclined groove toward the tread end by an interval 20%-30% of the tread expansion radius.