A system for manipulating the steering axis angle of an object is provided. The system is beneficial for improving performance and enjoyability of use for objects employing a steering axis, including bicycles, toys, tools, sporting goods, and other modes of transportation. The system includes a reversible bearing plate with a bearing plate bore that permits passage of a steerer tube through a head tube when reversible bearing plates are installed at the head tube ends. The bearing plate bore may be at the center of the reversible bearing plate to maintain a steering axis coaxial with the head tube central axis. The bearing plate bore may be offset from the center of the reversible bearing plate and may employ an angled annular space such that when reversible bearing plates are installed oppositely at the head tube ends, the steering axis is offset from the center of each reversible bearing plate generating an angle between the steerer tube central axis and the head tube central axis, resulting in a correspondingly steeper or slacker head angle. Methods of employing reversible bearing plates for maintaining, steepening, or slackening the head angle of a bicycle are provided.

A shock absorber includes a stationary part; a steering part extending in a longitudinal direction and rotatably coupled to the stationary part by a rotation axis in the longitudinal direction; a sliding part which forms an internal space containing fluid between the steering part and slidably coupled to the steering part in a direction in which the steering part extends; an elastic body having both ends respectively coupled to the steering part and the sliding part to support the steering part and the sliding part and maintain the internal space between the steering part and the sliding part; a flow path formed in the sliding part and configured to communicate the internal space between the steering part and the sliding part to outside so that the fluid can flow; and a steered driving wheel slidably connected to the sliding part.

A bicycle fork including two fork legs connected with each other via a fork bridge. The fork bridge is connected with a steer tube. For a simpler arrangement of shift cables, hydraulic lines, cables and the like, the steer tube includes at least one flattening extending in the longitudinal direction of the steer shaft.

A bicycle includes a frame, a front fork, a fixed stop member fixed in relation to the frame, a bearing member that supports the front fork relative to the frame for rotation about a steering axis, and a compression ring. The compression ring includes a body portion between the bearing member and the front fork and a stop portion rotationally aligned with the fixed stop member to inhibit over-rotation of the front fork relative to the frame. The stop portion comprises a second material that is harder than the first material of the body portion. For example, the stop portion can include a contact surface that contacts the fixed stop member when the front fork is sufficiently rotated, and the contact surface can comprise the second material. In one embodiment, the second material comprises one or more of aluminum, titanium, ceramic, and steel. The body portion can be formed as an overmold on the stop portion.

A steering stop for bicycle handlebars includes a first stop element. The stop element can be connected to a steer tube of a bicycle fork in particular in a clamping manner and includes two stops. A second stop element can be fixed on the bicycle frame and cooperates with the first stop element. For passing lines therethrough, which originate for example at a brake and/or gearshift unit, the first stop element includes at least one recess.

A steering stop for bicycle handlebars includes a first stop element. The stop element can be connected to a steer tube of a bicycle fork in particular in a clamping manner and includes two stops. A second stop element can be fixed on the bicycle frame and cooperates with the first stop element. For passing lines therethrough, which originate for example at a brake and/or gearshift unit, the first stop element includes at least one recess.

The invention proceeds from a steering device for two- and three-wheeled vehicles, which ensures a rotationally fixed connection between handlebars and a handlebar stem and/or between a handlebar stem and a fork of the two- or three-wheeled vehicle, and a steering device for two- and three-wheeled vehicles having a stop. The steering device has a frame with a head tube (1), a fork (2) with a stem tube (3) and a handlebar stem (4) with handlebars (7). In addition, a stop can be provided for the handlebars (7), which consists of a base (12), which is connected in a rotationally fixed manner to the fork (2) of the two- or three-wheeled vehicle, with a recess (14) and a stop element (15), which is securely arranged in the bearing shell (11) and protrudes radially into the recess (14).

According to the invention, in each case one component of the rotationally fixed connection has a smooth cylindrical surface over its axial length, whilst the surface, which is in frictional operative connection with this smooth cylindrical surface in the mounted state, of the other component, which is arranged coaxially to that first-mentioned, is constructed as an n-sided polygon.

The invention proceeds from a steering device for two- and three-wheeled vehicles, which ensures a rotationally fixed connection between handlebars and a handlebar stem and/or between a handlebar stem and a fork of the two- or three-wheeled vehicle, and a steering device for two- and three-wheeled vehicles having a stop. The steering device has a frame with a head tube (1), a fork (2) with a stem tube (3) and a handlebar stem (4) with handlebars (7). In addition, a stop can be provided for the handlebars (7), which consists of a base (12), which is connected in a rotationally fixed manner to the fork (2) of the two- or three-wheeled vehicle, with a recess (14) and a stop element (15), which is securely arranged in the bearing shell (11) and protrudes radially into the recess (14).

According to the invention, in each case one component of the rotationally fixed connection has a smooth cylindrical surface over its axial length, whilst the surface, which is in frictional operative connection with this smooth cylindrical surface in the mounted state, of the other component, which is arranged coaxially to that first-mentioned, is constructed as an n-sided polygon.

A bicycle includes a lower frame member and an upper frame member connected to a head tube. The lower frame member includes a down tube, a bottom bracket, and chain stays. The upper frame member includes a top tube, seat stays, and a passage formed in part by a first side wall and a second side wall. The first and second side walls include a first and second openings, respectively. A seat tube extends in an upward direction from the bottom bracket and through the passage. The seat tube includes an opening that extends laterally therethrough. A passive pivot assembly secures the seat tube within the passage, and includes a guide sleeve that extends through the first opening, through the opening in the seat tube, and through the second opening. One or more fasteners secure the guide sleeve to the upper frame member.

A coupled steering tilting and embedded independent shock absorption swing arm system (STS) system of a personal mobility vehicle, for example, but not limited to, a three-wheeled trike configuration, is disclosed.