| 摘要 |
PURPOSE:To prevent a road surface from damaging by maintaining appropriately a protrusion quantity of a spike irrespective of progress of wear of a tire tread, by providing a drive hole of the spike provided with a stepped and bottomed hole to be opened facing toward a bottom flange of the spike in the tread. CONSTITUTION:A stepped and bottomed holes 7 to be opened facing toward a bottom flange 2 of spikes S and S' are provided in drive holes of spikes provided in a tread 4 of a tire. Deterrent action for sinking through a casing part 5 is alleviated due to the existence of the stepped and bottomed holes 7 and moreover the allowance for elastic deformation and restoration under a load acting upon spikes 3 are improved. Thereby, the damage to a road surface irrespective of wear of the tread can be prevented from occurring. |
