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Curiosity's left front wheel, sol 411 Curiosity took this photo of its left front wheel on sol 411 (October 2, 2013). A hole in the wheel is visible. Holes in the wheels are not a concern for the Curiosity mission; such wear and tear is expected, especially in the thinnest areas of the wheels between the treads. NASA / JPL / MSSS
Here is a zoom view of the tear:
Detail view of Curiosity's left front wheel, sol 411 (October 2, 2013)Image: NASA / JPL / MSSS