That is because the present invention makes the length of each first block 5 in {HEAD ~ the tire circumferential direction} longer than the length of each second block 6 in {TAIL ~ the tire circumferential direction}, and concurrently because the sub groove 7 provided in each first block 5 is not allowed to communicate with the first main groove 2A 
That is because the present invention makes the length of each first block 5 in { HEAD ~ the tire circumferential direction } longer than the length of each second block 6 in { TAIL ~ the tire circumferential direction } , and concurrently because the sub groove 7 provided in each first block 5 is not allowed to communicate with the first main groove 2A
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