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