A studless tyre includes a tread portion having sipes. In a cross-sectional view of the tyre perpendicular to a circumferential direction, a profile of a tread face between an equatorial plane and each of tread edges is formed by three arcs convex radially outwardly. The arcs include an arc Ci counted an i-th from the equatorial plane in an axially outward direction and having a radius Ri and a tangent line of an arc C1 on the equatorial plane extends exactly in the axial direction. An arc C(i+1) and the arc Ci make contact at a point where they intersect. A radius R(i+1) is not greater than the radius (Ri). A ratio of a radius R2 with respect to a radius R1 is 40% or more and 70% or less. A ratio of a radius R3 with respect to the radius Ri is 15% or more and 30% or less.
STUDLESS TYRE
2020-01-30
Patent
Electronic Resource
English
IPC: | B60C VEHICLE TYRES , Fahrzeugreifen |