A landing gear arrangement may comprise a shock strut, a retraction actuator, and a shrink actuator. The retraction actuator may move the shock strut between a stowed position and a deployed position. The shrink actuator may move between a shrink position and an unshrink position in response to the shock strut moving between the stowed position and the deployed position.

A landing gear arrangement may comprise a shock strut, a retraction actuator, and a shrink actuator. The retraction actuator may move the shock strut between a stowed position and a deployed position. The shrink actuator may move between a shrink position and an unshrink position in response to the shock strut moving between the stowed position and the deployed position.

A shock absorber is provided, including a base, a first axial tube, a second axial tube, a buffering structure and an abutting assembly. The base defines an axial direction, and the base has a through hole radially. An exterior circumferential wall of the first axial tube has a recess formed radially and near a first end of the base, and the first axial tube is screwed with the base. The abutting assembly includes an abutting member and an elastic abutting member, the abutting member is disposed within the through hole, the elastic abutting member is disposed on the base and at least partly located in the through hole so as to abut the abutting member to move toward the base normally.

A shock absorber is provided, including a base, a first axial tube, a second axial tube, a buffering structure and an abutting assembly. The base defines an axial direction, and the base has a through hole radially. An exterior circumferential wall of the first axial tube has a recess formed radially and near a first end of the base, and the first axial tube is screwed with the base. The abutting assembly includes an abutting member and an elastic abutting member, the abutting member is disposed within the through hole, the elastic abutting member is disposed on the base and at least partly located in the through hole so as to abut the abutting member to move toward the base normally.

A bicycle can include a suspension system with a shock absorber. The shock absorber can have a sag position which can be adjustable. Sag refers to the amount of movement experienced by the suspension under a static load, such as that of the weight of a rider. Methods and systems to set sag can include at least one valve in fluid communication with a gas chamber of the shock absorber. In some embodiments, the at least one valve can be used to automatically set the sag position based on an individual's weight and riding position.

A bicycle can include a suspension system with a shock absorber. The shock absorber can have a sag position which can be adjustable. Sag refers to the amount of movement experienced by the suspension under a static load, such as that of the weight of a rider. Methods and systems to set sag can include at least one valve in fluid communication with a gas chamber of the shock absorber. In some embodiments, the at least one valve can be used to automatically set the sag position based on an individual's weight and riding position.

A multi-piece nut for use with a shock is provided. The multi-piece nut includes a first nut member and a second nut member removably coupled to the first nut member. The first nut member and second nut member include threads on an inner surface that correspond to each other when coupled together. The multi-piece nut may also include an aperture formed when the first nut member and second nut member are coupled together. The first and second nut members are coupled around a shock absorber, and the shock absorber extends through the aperture and engages the threads. The nut can then be rotated to adjust the spring of the shock.

A multi-piece nut for use with a shock is provided. The multi-piece nut includes a first nut member and a second nut member removably coupled to the first nut member. The first nut member and second nut member include threads on an inner surface that correspond to each other when coupled together. The multi-piece nut may also include an aperture formed when the first nut member and second nut member are coupled together. The first and second nut members are coupled around a shock absorber, and the shock absorber extends through the aperture and engages the threads. The nut can then be rotated to adjust the spring of the shock.

A non-drive dynamic stabilizer includes a damper and an actuator. The dynamic stabilizer provides multiple states of support to a solar tracker structure. These states may include 1) flexible movement and/or damping during normal operation (i.e. tracking) and/or 2) rigid or locked, whereby the dynamic stabilizer acts as a restraint. The dynamic stabilizer is actuated by a control system according to the real-time demands on the structure. Sensors to provide input to the control system may include wind speed sensors, wind direction sensors, snow sensors, vibration sensors and/or displacement sensors.

A non-drive dynamic stabilizer includes a damper and an actuator. The dynamic stabilizer provides multiple states of support to a solar tracker structure. These states may include 1) flexible movement and/or damping during normal operation (i.e. tracking) and/or 2) rigid or locked, whereby the dynamic stabilizer acts as a restraint. The dynamic stabilizer is actuated by a control system according to the real-time demands on the structure. Sensors to provide input to the control system may include wind speed sensors, wind direction sensors, snow sensors, vibration sensors and/or displacement sensors.