the framesets front tube.
The tube at the front of a bicycle frame that contains the headset. The steerer of the fork inserts through this part of the frame.
Vertical frame tube onto which the top tube and down tube are attached. The fork steerer tube is inserted into the head tube.
Short vertical tube at the very front or head of the bike. The hand tube contains the stem (which connect to the handlebars) and the steerer tube from the front fork.
1: Forward-most tube of the frame, which runs perpendicular to the ground. 2: Connects the front stem to the fork in combination with the headset.