Cutting edge looks pretty skinny on both upper and lower like it's already been flipped once. Check the back side, I'd bet you are riding on the bolts already.
Screw the shoes down some, and lock 'em (are they even there?) they are there so the cutting edge don't wear so much. I'd take 'em down below the edge about 3/16- 1/4", so the edge don't leave rust marks all over the sidewalks come spring/summer.
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