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Pneumatic tires for large size and high speed motorcycles

  • US 4,289,182 A
  • Filed: 12/17/1979
  • Issued: 09/15/1981
  • Est. Priority Date: 12/29/1978
  • Status: Expired due to Term
First Claim
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1. A pneumatic tire for motorcycles comprising, a tread extending about a crown of a toroidal carcass along a sectional profile of said carcass from a center of the crown to both sides thereof to such an extent that the tread has a width larger than a maximum width between sidewalls of the tire, said tread including a circumferential center groove located at the equatorial center line of the tread, a pair of circumferential central side grooves located adjacent and symmetrically on each side of said center groove, a pair of circumferential shoulder grooves located at shoulder portions adjacent to tread edges, circumferential ribs divided by said center groove and said central side grooves, and a pair of staggered ribs defined by said central side grooves, said staggered ribs having bending portions, said shoulder grooves and oblique grooves, said oblique grooves comprising first oblique grooves extending from said central side grooves toward the tread edges and terminating at top ends which do not reach the tread edges, and second oblique grooves which extend from shoulder grooves toward the central side grooves and terminate at top ends which do not reach the central side grooves and substantially parallel to the first grooves, each center line of said first and second oblique grooves inclined at an angle of 40°

  • to 80°

    with respect to the center line of each central side grooves, bottoms of first oblique grooves at parts opening to each of the central side grooves and bottoms of the second oblique grooves at parts opening to each of the shoulder grooves are formed with projected platforms respectively, each bending portion of each staggered rib adjacent to the central side groove provided with a small groove aligned in parallel with the central side groove, and a pitch length defined by a circumferential interval between first oblique grooves is in the range of 1/40 to 1/60 of the total circumferential length of the tread.

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