(H) CENTER OF GRAVITY: Measure from the front of the back post at the seat tube to the center of the rear axle. With up to 1” difference between (C) and (D), a maximum of 3” forward is allowed. With 1-1/2” to 2-1/2” difference between (C) and (D), a maximum of 4” forward is allowed. With 3” difference between (C) and (D), a maximum of 5” forward is allowed.