The present invention relates to a pneumatic tire with rubber lump applied to the bead portion, and more particularly, to a pneumatic tire wherein bead portion is reinforced by applying rubber lump on the side surface of lower portion of bead with carcass ply, optionally together with flipper which provides reinforcement, spirally wound through upper, side and lower portion of said rubber lump to the arbitrary point of upper portion of said bead so that by minimizing the movement of bead by means of said carcass ply or flipper, bead portion of tire is not easily broken away from the rim when air is evacuated from a tire which is installed on a special rim that does not have flange or while driving with tire of low air pressure.