A tire reinforcing arrangement includes an outer tire having two hooked flanges at two sides, two annular spare tires bilaterally set inside the outer tire, each annular spare tire being formed of a plurality of spare tire blocks that are fastened to one another by links and screw bolts, each spare tire block having two mounting through holes, a top locating groove adapted to receive the hooked flanges of the outer tire, an embossed bottom wall, and two projecting portions diagonally disposed at two ends, and stretchers respectively stopped between the annular spare tires.