Pneumatic tire with {HEAD ~ tread} having see through main groove with amplitude, blocks and {TAIL ~ sub grooves} 
Pneumatic tire with { HEAD ~ tread } having see through main groove with amplitude , blocks and { TAIL ~ sub grooves }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL