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In dirt, the trail often goes negative. If you drop a plumb bob down the axle line you will find that the contact patch for the tire on one side of the axle is equal to the other side. The plumb bob turns out to be the centerline of the contact patch. If you are calculating the trail you often start with the center of the 3-4" contact patch as one marker and the second marker would be where the rake centerline crosses the pavement. Join the two and that is the trail.And on solo trail. Why?