If there’s 1/2″ to 3/4″ of space on either side of your fist, the saddle is approximately a medium tree. Use the bottom of the tree points as your measuring locations. Pin on Equine Products With your other hand place your measuring tool over the withers. How to measure a western saddle tree . How can you tell if the tree angle on your saddle is correct for your horse? And if there’s more than 1″ of space on either. The two most critical measurements on a western saddle is the gullet width and the bars. Think of the saddle as having two sides, top and bottom. The numbers at the front of the card s represent the distance from b to a (just behind the scapula) in this case about 8 1/2″ for this horse. With gentle pressure locate the back edge of the shoulder blade (scapula) with one or 2 fingers and keep them there. The skirt of the western saddle is the leather or other material attached around the seat of the saddle. A narrow or tight angle will make contact at the...