A bead seat rubber 21 provides {HEAD ~ the interface contact} with the rim 70 and is made of {TAIL ~ any suitable bead seat material} standard in the industry 
A bead seat rubber 21 provides { HEAD ~ the interface contact } with the rim 70 and is made of { TAIL ~ any suitable bead seat material } standard in the industry
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH