| 摘要 |
A heavy duty radial tyre has decoupling groove (6), which is directed to the circumference, at shoulder part (4) at both edges of tread (5). The tread (5) has a given width (TW) and main groove (5') arranged on the surface. For the groove (6) e1 is less than e2, E is in the range of 0.35-0.55, and the width (W) is 1-2 % of tread width (TW). The groove (6) is placed 92-98 % of TW/2 apart to the outside from tread center (C) and has a depth similar is main groove (5'). The length (H1) in the groove (6) is 30-70 % of the depth (H), and the width (W1) is 30-60 % of the groove width (W). H1 and W1 make a step (7) in the groove (6).
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