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Quick release skewer, removed from a hub, in the closed position Hub with its skewer mounted Quick release clamp on a seatpost. A quick release skewer is a mechanism for attaching a wheel to a bicycle. It consists of a rod threaded on one end and with a lever operated cam assembly on the other.
Whether integrated or separate, the seatpost bolt can have a simple nut, can be an Allen bolt, or can include a quick-release mechanism, with a handle that releases the clamp without tools. [9] A quick-release allows easy height adjustment of the seat, though increases the risk of seat theft unless it is also used to detach the seat when parking.
Portage strap: a strap (usually made of leather) attached to the inside of the bike frame, designed to make carrying the bike over one's shoulder easier; Pulley wheel: see Jockey wheel; Power meter: a device on a bicycle that measures the power output of the rider; Quick release: a skewer with a lever on one end that loosens when the lever is ...
The Swift Folder design employs a vertical folding method, using the seat-post and a split seat-tube as the locking mechanism. To fold, the seat-post is released from the two parts of the seat-tube by their respective quick release clamps, then pulled up into the upper part of the seat-tube to unlock the frame. A pivot in the main frame tube then allows the rear triangl
Many folding frames follow the classic frame pattern of the safety bicycle's diamond frame, but feature a hinge point (with single or double hinges) allowing the bicycle to fold approximately in half. Quick-release clamps enable raising or lowering steering and seat columns. A similar swing hinge may be combined with a folding steering column.
Before epicyclic gears were used in bicycle hubs, they were used on tricycles. Patents for epicyclic hubs date from the mid-1880s. [5] [6] The first patent for a compact epicyclic hub gear was granted in 1895 to the American machinist Seward Thomas Johnson of Noblesville, Indiana, U.S.A. [7] This was a 2-speed but was not commercially successful.