The only part of the bicycle 12 shown in FIG 1 is the rear part, including a saddle 28 mounted on a seatpost 29, which is typically telescopically inserted in the upper end of a seat tube 31 that constitutes part of {HEAD ~ the frame} 32 of {TAIL ~ the bicycle} 
The only part of the bicycle 12 shown in FIG 1 is the rear part , including a saddle 28 mounted on a seatpost 29 , which is typically telescopically inserted in the upper end of a seat tube 31 that constitutes part of { HEAD ~ the frame } 32 of { TAIL ~ the bicycle }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL