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 and defining a closeable gap with adjacent interior portions of the outer rim to define a mechanical stop to limit relative movement of the inner rim and outer rim.

A supplemental tire tread for installation on an outer surface of a solid tire, the outer surface of the solid tire defining opposed sidewalls and a tread surface that extend between the sidewalls. The supplemental tire tread has a tread body having an outer tread surface, an inner surface, and an attachment for attaching the tread body around the tread surface of the tire. The inner surface of the tread body has tire supports with tire receiving receptacles that open away from the inner surface of the tread body and receive the solid tires when installed. The tread body has anchor receptacles that engage anchors that pierce the solid tires to support the tread body against relative rotation of the solid tire and the tread body.

A supplemental tire tread for installation on an outer surface of a solid tire, the outer surface of the solid tire defining opposed sidewalls and a tread surface that extend between the sidewalls. The supplemental tire tread has a tread body having an outer tread surface, an inner surface, and an attachment for attaching the tread body around the tread surface of the tire. The inner surface of the tread body has tire supports with tire receiving receptacles that open away from the inner surface of the tread body and receive the solid tires when installed. The tread body has anchor receptacles that engage anchors that pierce the solid tires to support the tread body against relative rotation of the solid tire and the tread body.

A tire comprises a tread portion 2. The tread portion 2 is provided with at least one main groove 3 extending continuously in a tire circumferential direction. A first groove wall 10, which is one of groove walls of the main groove 3, is provided with at least one first recessed portion 11 recessed outwardly in a groove width direction from a corresponding one of groove edges 6 of the main groove on a ground contacting surface of the tread portion 2. In the first recessed portion 11, a recess amount from the corresponding one of the groove edges 6 gradually decreases toward both sides in the tire circumferential direction from a deepest portion 15 recessed most outwardly in the groove width direction.

A pneumatic tire comprises a carcass layer, a belt layer disposed on the outer side in the tire radial direction of the carcass layer, and tread rubber disposed on the outer side in the tire radial direction of the belt layer. The belt layer is formed by laminating a pair of cross belts having belt angles with an absolute value from 10° to 45° both inclusive and mutually opposite signs, and a circumferential reinforcing layer having a belt angle within a range of ±5° relative to the tire circumferential direction. The distance (Gcc) from the tread profile to the tire inner circumferential surface along the tire equatorial plane and the distance (Gsh) from the tread edge to the tire inner circumferential surface have a relationship satisfying 1.10≤Gsh/Gcc. The groove depth (Dsh) and under-groove gauge (UDsh) of the outermost circumferential main groove have a relationship satisfying 0.20≤UDsh/Dsh.

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 inner rim. The wheel assembly may include gas springs operatively coupled between the inner rim and the outer rim and tread assemblies carried by the outer 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. Gas springs may be operatively coupled between the inner rim and the outer rim and permitting relative movement therebetween. The wheel assembly may also include a sensor configured to sense the relative movement between the inner and outer rims.

Rubber compositions and treads made from such rubber compositions, the rubber composition based upon a cross-linkable rubber composition, the cross-linkable rubber composition having between 15 phr and 45 phr of a modified styrene butadiene rubber, between 55 phr and 85 phr of a polyisoprene rubber and no more than 5 phr of a third diene rubber component. Such rubber compositions may further include between 35 phr and 60 phr of a silica reinforcing filler and a sulfur curing system. The modified styrene butadiene rubber that is useful for the rubber compositions disclosed herein have a glass transition temperature of no more than −70° C. and is modified with an active moiety that interacts with the silica.

Rubber compositions and treads made from such rubber compositions, the rubber composition based upon a cross-linkable rubber composition, the cross-linkable rubber composition having between 15 phr and 45 phr of a modified styrene butadiene rubber, between 55 phr and 85 phr of a polyisoprene rubber and no more than 5 phr of a third diene rubber component. Such rubber compositions may further include between 35 phr and 60 phr of a silica reinforcing filler and a sulfur curing system. The modified styrene butadiene rubber that is useful for the rubber compositions disclosed herein have a glass transition temperature of no more than −70° C. and is modified with an active moiety that interacts with the silica.

A wheel for a non-motorized vehicle (e.g., a shopping cart) can include a housing assembly and a tread assembly. The housing assembly can be configured to sealingly house electronics or other components. The tread assembly can removably mate with the housing assembly such that the electronics or other components remain closed and/or sealed within the housing assembly when the tread assembly is mated or unmated with the housing assembly.