| 摘要 |
A heavy duty tire comprises a tread portion provided with a central circumferential groove, a crown circumferential groove on each side thereof and crown axial grooves extending therebetween so as to for crown blocks. The crown block is circumferentially subdivides into two block pieces by a crown narrow groove. The crown axial groove is provided in the groove bottom with a tie bar rising therefrom and connecting the circumferentially adjacent two crown blocks each other. The crown axial grooves are inclined at an angleαof from 10 to 30 degrees with respect to the tire axial direction. The central circumferential groove and an axially inner part of the crown axial groove which part is axially inside the tie bar, are shallower than the crown circumferential groove.
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