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The size of your saddle's tree will determine the way the saddle fits your horse. The equine industry does not have a required guideline that designates tree size, but you can use several methods to closely approximate the size of your saddle's tree.
Contact the Manufacturer
The easiest way to determine saddle tree size is by contacting the manufacturer and asking. A decent quality saddle will have both a manufacturer's label and a serial number stamped or engraved on a plate that is located somewhere on the saddle. This information is normally located on the left strap holder or on the fender. You also may find it on the stirrup strap.
Once you have found the saddle's manufacturer and the model or serial number for your saddle, email or call the manufacturer's customer service department. Ask them to look up the information on your saddle's tree size. If the manufacturer is no longer in business, a little bit of Internet researching will often give you the information you need.
Measuring the Saddle Tree
Saddle tree size is determined by the angle of the bars of the saddle as they come down from the gullet. The greater the angle of the bars is, the wider the tree. You can make specific measurements by using a device that is specifically designed to measure angles, also known as a protractor.
Generally speaking, a saddle with a normal or narrow bar angle is classified as having regular or semi-quarter horse bars. The exact measurement of these bars will be an angle of 86 degrees, plus or minus 3 degrees in either direction. A saddle that has full quarter horse bars, also known as a wide tree, generally has a measurement of 90 degrees, plus or minus 3. A very wide tree will have an angle of 94 degrees plus or minus 3. Very wide trees are often used on large horses such as drafts.