FI971153A - Pneumatic tire - Google Patents

Abstract

Pneumatic tyre comprising a wearing surface portion having two wearing surface edges E whereby said wearing surface part is provided with peripheral main grooves and axial grooves for the definition of wearing surface blocks, each wearing surface block being provided with at least one sipe extending in the peripheral direction of the tyre in order to divide the block in at least two axial parts. The peripheral main grooves are two peripheral main grooves GO2 which are placed at symmetric axial places relative to the centre-line C, whereby each and any of said two peripheral main grooves GO2 defines a peripheral row consisting of wearing surface blocks SB, said row placing itself near the groove GO2, whereby the sipes S of the wearing surface blocks SB divide the block SB in a broad main part B2 and a narrow crosswise part B1 on the side of the peripheral main groove, whereby the peripheral length L of the narrow crosswise part B1 is larger than 3.0 times and smaller than 20.0 times the width of the groove width of the peripheral main grooves GO2, whereby the average depth SH of each and every sipe S is 0.25 to 1.0 times the groove depth GH of the peripheral main grooves, the groove depth gH of the axial grooves g being larger than 0.40 times and less than 1.0 times the groove depth GH of the peripheral main grooves. <IMAGE>