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Seat tube: the roughly vertical tube in a bicycle frame running from the seat to the bottom bracket; Seat bag: a small storage accessory hung from the back of a seat; Seatpost: a post that the seat is mounted to. It slides into the frame's seat tube and is used to adjust ride height depending how far into the seat tube it is inserted
The larger diameter of the head tube and headset gives added stiffness to the steering portion of the bicycle. Common sizes. 25.4 mm (1 in) steerer tube, this may have a fork crown (the base of the fork steerer tube) of a number of different dimensions, and milling may be necessary to make some headsets fit. 26.4 mm crown race (ISO standard)
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Less commonly 31.8 mm (1 + 1 ⁄ 4 in) was used on some mountain bikes and tandems and has now returned on some carbon fiber forks, and 38.1 mm (1 + 1 ⁄ 2 in) is found on high end Downhill bikes. A threadless stem should match the outside diameter of the steerer tube; a reducing shim may be employed to match a 28.6 mm ( 1 + 1 ⁄ 8 in) stem ...
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The head tube contains the headset, the interface with the fork. The top tube connects the head tube to the seat tube at the top. The top tube may be positioned horizontally (parallel to the ground), or it may slope downwards towards the seat tube for additional stand-over clearance. The down tube connects the head tube to the bottom bracket shell.
From 1989 through 2001, Derby International marketed bikes in the United States under the Nishiki as well as Univega, Haro, and Raleigh brand names. Some of the all terrain bikes and mountain bike models were designed in partnership with famed mountain bike designer and Mountain Bike Hall of Fame member R. Cunningham and have his name on the frames.