{HEAD ~ a gear ratio detector} for detecting {TAIL ~ the gear ratio} set by said variable gear ratio mechanism, 
for detecting
{ HEAD ~ a gear ratio detector } for detecting { TAIL ~ the gear ratio } set by said variable gear ratio mechanism ,
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH