Pneumatic safety tire for motorcycles

Claim 1

A pneumatic safety tire for motorcycles, comprising: a pair of axially spaced annular beads, a toroidal carcass extending across the beads and forming a pair of sidewalls connected by a carcass crown portion, a tire tread secured onto the outer surface of the carcass at said crown portion, said tire tread having a width sufficiently wide to provide a thorough contact area with the ground even when the tire is tilted at a camber angle when cornering and having a substantially uniform thickness along the outer peripheral surface of said carcass, a pair of sidewall rubbers secured to the carcass and extending from the beads to the side edges of the tire tread, and a pair of elastic reinforcing layers continuously extending along the inner surface of the carcass in a complementary fashion to said sidewalls to supplement the thickness of said sidewalls and enhance the rigidity of the sidewalls and their ability for supporting a load under conditions of reduced tire pressure, each of said reinforcing layers being made of a rubber-like material with a Shore A hardness of no less than 45 and having a relatively thick central portion and thinned edge portions which become progressively thinner toward the ends thereof, said reinforcing layer extending toward the equatorial plane of the tire beyond the point of alignment with the side edge of the tire tread with the distance X from the alignment point to the termination point of the reinforcing layer with said carcass in the direction of the equatorial plane of the tire being not smaller than 20 percent of the distance L from the alignment point to the equatorial plane of the carcass, said elastic reinforcing layer having a maximum thickness corresponding to 3 to 15 percent of the maximum width of the toroidal carcass under inflated condition.