Abstract: A support arm with a hinged clamp allowing it to be secured around a bicycle seat post such that a detached front wheel is carried on the bike on the seat post. The support arm has two fingers that attach to a bicycle's front wheel once it has been detached from the bicycle. The free end of the fingers are secured to the axle at the fitting where the fork had been attached. The quick-release fitting secures the fingers in place. The clamp has two c-channel clamping members that encircle the tubular seat post. The clamping members are secured together with a latching means.

Abstract: A pneumatically-inflated inner tube having two compartments such that if one compartment is damaged and deflates, the other compartment may be inflated without removing the tire. The compartments inflate independently of each other using separate valves; each compartment has its own valve for inflation. When inflated, the two compartments surround the same annular axis. The two embodiments described have primary and secondary compartments. In the first embodiment, each compartment is a discrete component wherein the secondary compartment is disposed inside the primary compartment. The compartments connect where the valve of the secondary compartment projects through an aperture in the primary compartment. In the second embodiment, the two compartments form an integral unit. The compartments share a common surface such that one compartment is formed inside the other compartment.