Tyre

A tyre comprising a tread portion having a main groove extending continuously in a tyre circumferential direction and a pair of land regions adjacent to the main groove on both sides thereof, wherein

• at least one of the pair of the land regions has, on an edge thereof facing the main groove, a plurality of main groove side step-like portions,
• a height of each of the plurality of the main groove side step-like portions is decreased stepwise in two or more steps from a ground contacting surface of the at least one of the pair of the land regions to a bottom surface of the main groove,
• the plurality of the main groove side step-like portions includes a plurality of first main groove side step-like portions and a plurality of second main groove side step-like portions having different numbers of the steps from each other,
• each of the second main groove side step-like portions has a larger number of the steps than each of the first main groove side step-like portions,
• the main groove extends in a zigzag manner,
• the tread portion has a plurality of lateral grooves extending from the main groove in a tyre axial direction and arranged at intervals in the tyre circumferential direction, and
• at least one of the lateral grooves is connected to a peak of the zigzag of the main groove to form a Y-shaped three-way junction, and among three corner portions of the land regions forming the three-way junction, one corner portion not immediately adjacent to the at least one of the lateral grooves is provided with one of the second main groove side step-like portions, and each of the other two corner portions is provided with one of the first main groove side step-like portions.

A tyre comprising a tread portion having a main groove extending continuously in a tyre circumferential direction and a pair of land regions adjacent to the main groove on both sides thereof, wherein

• at least one of the pair of the land regions has, on an edge thereof facing the main groove, a plurality of main groove side step-like portions,
• a height of each of the plurality of the main groove side step-like portions is decreased stepwise in two or more steps from a ground contacting surface of the at least one of the pair of the land regions to a bottom surface of the main groove,
• the plurality of the main groove side step-like portions includes a plurality of first main groove side step-like portions and a plurality of second main groove side step-like portions having different numbers of the steps from each other,
• each of the second main groove side step-like portions has a larger number of the steps than each of the first main groove side step-like portions,
• both of the land regions have the second main groove side step-like portions, and
• the second main groove side step-like portions of one of the land regions overlap in a tyre axial direction with the second main groove side step-like portions of the other land region.