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Crooked Grinds are a relatively difficult skateboard grind trick. They involve ollieing onto the grind surface and leaning forward so that you’re only grinding on the front truck (like a Nosegrind), with the back of the board pointing away from the grinding surface. It is also known as a Crook Grind or K-Grind. Eric Koston and Dan Peterka are both credited with coming up with the Crooked Grind.