Patent ID: 7416004

Claim:
A pneumatic tire comprising a tread portion provided with blocks, said blocks axially divided by at least one circumferential groove and circumferentially divided by oblique grooves inclined with respect to the tire axial direction towards one direction, and each said block subdivided into at least two parallelogrammic block elements by at least one open sipe extending across the block and inclined at an inclination angle αo with respect to the tire axial direction towards the same direction as the oblique grooves, wherein said at least one open sipe is substantially parallel with the oblique grooves adjacent to the block, whereby said at least two parallelogrammic block elements are arranged side-by-side in the tire circumferential direction, said at least two parallelogrammic block elements including two block-end elements located on the circumferential ends of the block, and each said parallelogrammic block element provided with at least one closed sipe extending at an inclination angle αc of less than 45 degrees with respect to the tire axial direction and terminating within the block to have closed ends, wherein the difference (αo−αc) between said angles αo and αc is more than 0 but not more than 45 degrees, and said two block-end elements are each provided with a plurality of closed sipes inclusive of said at least one closed sipe, which are circumferentially shifted from each other so as not to align with each other.