Disclosed is a folding bicycle, including: a front wheel, a rear wheel, a handlebar, a main frame, a support frame, a pedal mechanism, a first safety clamp, and a second safety clamp, the first safety clamp being configured to secure relative position between the support frame and the main frame; and a second rotating shaft is disposed between the through-hole and the position where the main frame joins with the handlebar. The folding bicycle disclosed offers an advantage of portability.

A wheel assembly may include an inner rim to be coupled to the hub of the vehicle, and an outer rim surrounding the inner rim. The wheel assembly may also include gas springs operatively coupled between the inner rim and the outer rim and permitting relative movement therebetween. The wheel assembly may also include a rigid inboard cover ring coupled to an inboard side of the outer rim and extending radially inward toward the inner rim. A flexible inboard seal may be coupled between the rigid inboard cover ring and the inner rim.

A wheel assembly may include an inner rim to be coupled to the hub of the vehicle, and an outer rim surrounding the inner rim. The wheel assembly may also include gas springs operatively coupled between the inner rim and the outer rim and permitting relative movement therebetween. The wheel assembly may also include a rigid inboard cover ring coupled to an inboard side of the outer rim and extending radially inward toward the inner rim. A flexible inboard seal may be coupled between the rigid inboard cover ring and the inner rim.

A wheel assembly may include an inner rim, and an outer rim surrounding the inner rim. The outer rim may include outer rim segments each hingeably coupled in end-to-end relation to an adjacent outer rim segment to define the outer rim. The wheel assembly may also include gas springs operatively coupled between the inner and outer rims, and tread members each carried by a respective one of outer rim segments.

A wheel assembly may include an inner rim, and an outer rim surrounding the inner rim. The outer rim may include outer rim segments each hingeably coupled in end-to-end relation to an adjacent outer rim segment to define the outer rim. The wheel assembly may also include gas springs operatively coupled between the inner and outer rims, and tread members each carried by a respective one of outer rim segments.

A variable diameter wheel comprises a central hub, a peripheral band formed by a plurality of arcuate segments, each one of the arcuate segments being linked to the hub, wherein the hub comprises radial guide means for sliding retractable radial arms, each one of the retractable radial arms being secured to the distal end thereof of one of the arcuate segments, the opposing end being provided with a connection member with a mobile plate coaxial with the hub and in relative rotation with respect to the hub, the mobile plate having curved guide areas, each one of the connection members cooperating with one of the arms in order to control the linear and radial movement of the proximal end of the corresponding arm.

A variable diameter wheel comprises a central hub, a peripheral band formed by a plurality of arcuate segments, each one of the arcuate segments being linked to the hub, wherein the hub comprises radial guide means for sliding retractable radial arms, each one of the retractable radial arms being secured to the distal end thereof of one of the arcuate segments, the opposing end being provided with a connection member with a mobile plate coaxial with the hub and in relative rotation with respect to the hub, the mobile plate having curved guide areas, each one of the connection members cooperating with one of the arms in order to control the linear and radial movement of the proximal end of the corresponding arm.

A wheel assembly to be coupled to a hub of a vehicle may include an inner rim to be coupled to the hub of the vehicle and an outer rim surrounding the hub. The wheel assembly may also include gas springs operatively coupled between the inner rim and the outer rim to provide a gas suspension for relative movement between the inner rim and the outer rim. The wheel assembly may also include a disk coupled to the inner rim. The wheel assembly may also include inboard lateral stops carried by an inboard interior surface of the outer rim, and outboard lateral stops carried by an outboard interior surface of the outer rim so that the inboard lateral stops and the outboard lateral stops cooperate to limit relative lateral movement of the disk and the outer rim.

A wheel assembly to be coupled to a hub of a vehicle may include an inner rim to be coupled to the hub of the vehicle and an outer rim surrounding the hub. The wheel assembly may also include gas springs operatively coupled between the inner rim and the outer rim to provide a gas suspension for relative movement between the inner rim and the outer rim. The wheel assembly may also include a disk coupled to the inner rim. The wheel assembly may also include inboard lateral stops carried by an inboard interior surface of the outer rim, and outboard lateral stops carried by an outboard interior surface of the outer rim so that the inboard lateral stops and the outboard lateral stops cooperate to limit relative lateral movement of the disk and the outer rim.

A bicycle component comprises a first structural member made of a conducting material, an electrical insulation layer provided to the first structural member, and a second structural member configured to be attached to the electrical insulation layer by adhesive.