{HEAD ~ The distance} between {TAIL ~ the center} of said sensing chip 31 to the center of said wheel body 11 is represented by r 
between
{ HEAD ~ The distance } between { TAIL ~ the center } of said sensing chip 31 to the center of said wheel body 11 is represented by r
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH