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Another method for increasing the fore-aft adjustment is the swept-back seatpost, where the seatpost has a curve in it over the 150 mm (6 in) or so before the saddle. Because of the gentle sweep of the tube, the top part of the seatpost cannot fit within the seat tube, so this solution is useful only for high seat positions.
The most basic suspension seat post, a piston style, like the one pictured on the side, uses a sliding post with spring pressure that is often changeable by adjusting a threaded insert in the bottom of the post to adjust the preload on the spring. All piston style seatposts move in a down and forward motion at the slope the seat tube.
A "plain" seatpost (silver) connects the saddle to the frame (red). A microadjust seatpost (black) of a Trek Fuel 80 mountain bike. A seatpost with a significant setback on a BMX bike. A bicycle seatpost, [1] seatpin, [2] saddlepole, [3] saddle pillar, [4] or saddle pin [5] is a tube that extends upwards from the bicycle frame to the saddle ...
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; Seatstay: frame components, small diameter tubes running from top of seat tube to rear dropouts; Shaft-drive: alternate to chain-drive; Shifter: gear shifting control
Height adjustable suspension is a feature of certain automobile suspension systems that allow the motorist to vary the ride height or ground clearance. This can be done for various reasons including giving better ground clearance over rough terrain, a lower ground clearance to improve performance and fuel economy at high speed, [1] or for stylistic reasons.
A more-sophisticated model that allows a wheel to steer, adjust the path, and counter the torque of gravity, is necessary to capture the self-stability observed in real bikes. For example, a bike in a 10 m (33 ft) radius steady-state turn at 10 m/s (36 km/h, 22 mph) must be at an angle of 45.6°.