The pitch is governed by the dish of the wheels-, thus, a wheel having 1 1/4-in. dish would lay out more than a wheel having only , in. The general rule when setting out the wheels is that the face spokes in the bottom halves shall he parallel with each other - that is, square up from the ground line, no matter what dish there is. To obtain the length of the axle-tree, having set the wheels out to the required width for the track, hold a short straightedge on the back of the nave, parallel with the spoke, measure the distance from the straightedge to the back of the tyre, and deduct twice this measurement from the inside width of the track; this will give the length of the axle-tree at the shoulders.