Abstract: The present invention relates to a tube guard for protecting inner tubes of relatively thin tires. The tube guard is comprised of a unitary annular guard member molded from a solid flexible synthetic polymeric material having a high Shore hardness. The guard member includes a central section having a greater cross-section at the mid portion of the central section and two peripheral, generally parallel, tapered sections integral with and extending inwardly from the central section. The outer surface of the tube guard is rough to prevent slippage relative to the outer casing of the tire and the inner surface of the tube guard is smooth to prevent damaging the inner tube.