{HEAD ~ Gear ratio detector} detects {TAIL ~ the gear ratio} set by the variable gear ratio mechanism 
detects
{ HEAD ~ Gear ratio detector } detects { TAIL ~ the gear ratio } set by the variable gear ratio mechanism
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH