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