Frame : The structural piece, usually a number of tubes joined together, to which all of the components are attached.
Fork : The structural piece that attaches the frame to the front wheel. The fork turns to allow the rider to control the bicycle.
Frame set : The frame and fork combination.
Head Tube : The near-vertical tube that is the forward most past of the frame.
Top Tube : The upper tube of the frame that extends back from the head tube to the seat tube.
Down Tube : The lower tube of the frame that extends the bottom of the head tube to the bottom of the framr (the bottom-bracket shell).
Seat Tube : The near-vertical tube that is at the middle of the frame, which the seat post slides into.
Bottom-bracket Shell : The portion of the frame that contains the crankset bearing parts, which are called the bottom bracket.
Seat Stay : The two tubes of the frame that start from below the seat and meet the chain stays at the center of the rear wheel.
Chain stay : The two tubes of the frame that go from the lower end of the seat tube and meet the seat stays at the center of the rear wheel.
Drop Out : The fittings at the end of the fork and at the juncture of the seat stays and the chain stays, to which the weel are attached.
(barnettmanual).
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