The ornamental design for a tiresidewallspreader, as shown and described.
FIG. 1 is a top isometric view of the tire sidewall spreader embodying the new design showing visually tangential edges.
FIG. 2 is a top thereof.
FIG. 3 is a side view thereof with the opposing side view being a mirror image thereof.
FIG. 4 is a bottom view thereof.
FIG. 5 is a rear view thereof.
FIG. 6 is a front view thereof; and,
FIG. 7 is top isometric view of the tire sidewall spreader embodying the new design used in combination with a tire iron. Broken lines form no part of the design to be patented.