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Jagged rocks are common in Kansas' Flint Hills. The sharper ones take their toll on riders' tires. 2018 Dirty Kanza 200. © Ian Matteson/ ENVE Composites

Jagged rocks are common in Kansas’ Flint Hills. The sharper ones take their toll on riders’ tires. 2018 Dirty Kanza 200. © Ian Matteson/ ENVE Composites