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We run 1/8 and 1/10 on the same track so debate the jump sizes constantly. In my opinion 'bumps' should be about 8-12 inches, 'jumps' 12-24 inches for 1/10 scale. Jumps should have a groomed/scooped face for a clean launch and its helpful to make a landing slope as well. Roll a tire down the track to see if the jump angle will provide the height/distance that you need.