| 摘要 |
PROBLEM TO BE SOLVED: To make no rib punch of a second rib occur by lateral force at the time of turning etc. SOLUTION: In a pneumatic tire 1, narrow ribs 8, extending in a tire peripheral direction via narrow grooves 7, are dividedly formed on the shoulder side edge part of a secondary rib 5 from the utmost outer side to the inner side of a tread part 2. At that time, recesses 9 and projections 10A are alternately formed on the grounding side of the ribs 8 at intervals in the tire peripheral direction, and the projections 10A are surface-alignedly positioned on the surface same as surfaces of grounding surfaces 5A and 6A in both side ribs 5 and 6 at the time of no load (ungroundable time), and the recesses 9 are positioned in a diameter inner side than the grounding surfaces 5A and 6A. |
