Rotatable tire for barge bumper

In a bumper for an offshore oil rig or barge loading structure of the type in which an upright metal bumper pipe is mounted on upper and lower shock cells in turn mounted on a leg of such structure, and in which a stack of rubber rings normally surrounds said upright metal bumper pipe between said shock cells;

• wherein the improvement consists of a series of rotatable energy-absorbing, distortion-resisting, ringlike sleeves surrounding said upright metal bumper pipe stacked directly on one another and extending solely between said shock cells;
• each ringlike sleeve consisting of a rim-free pneumatic-type rubber-containing vehicle tire carcass, and a cured-within-the-carcass lightweight elastomeric foam filling in the carcass;
• and there being a rubber inner tube located within the carcass;
• the elastomeric foam filling being located within the rubber inner tube;
• and the foam filling being cured within said rubber inner tube located within the carcass.