If your horse is acting grumpy when you girth up, you might need to learn how to measure the bars on a saddle to see if the tree actually matches their back shape. It's one of those things that sounds incredibly technical—like you'd need an engineering degree to get it right—but it's actually something any horse owner can do with a few simple tools and a bit of patience.
Most of us have been there: you find a beautiful used saddle at a great price, the seller swears it's a "Full Quarter Horse Bar," and you get it home only to find it pinches your horse's shoulders or rocks like a hobby horse. The truth is, those labels like "semi" or "full" aren't standardized across the industry. One brand's wide is another brand's medium. That's why taking your own measurements is the only way to be sure.
What are we actually measuring?
Before you grab your tape measure, let's clear up what the bars actually are. When people talk about a saddle tree, they're talking about the skeleton inside the leather. The bars are the two long pieces that run parallel to the horse's spine. They're responsible for distributing your weight across the horse's longissimus dorsi muscles.
If the bars are too narrow, they'll pinch. If they're too wide, the saddle will collapse down onto the withers. But it's not just about width; it's about the angle and the "rock" (the curve from front to back). Measuring the bars isn't just a single number; it's more like capturing a 3D shape and trying to find its twin.
Tools you'll need to get started
You don't need anything fancy here. In fact, you can probably find most of this in your junk drawer or garage.
- A flexible curve or a piece of heavy-gauge wire: You can buy a professional flexible curve at an art supply store, but a piece of thick solder or even a coat hanger (if you're careful) works in a pinch. It just needs to be able to hold its shape once you bend it.
- A measuring tape: A soft sewing tape is best, but a standard metal one works too.
- A large piece of cardboard or heavy paper: This is for tracing your shapes.
- A marker: Something easy to see.
- A helper: It's much easier if someone can keep your horse standing square while you work.
Step 1: Mapping the horse's back
Since the bars of a saddle are usually tucked away under layers of fleece and leather, the easiest way to "measure" them is to measure the horse they are supposed to fit. This gives you a template to compare against any saddle you're looking at.
Start by making sure your horse is standing on level ground. If they're parked out or standing like a mountain goat, your measurements will be useless. Take your flexible curve and find the back edge of the shoulder blade (the scapula). Move about two inches behind that—this is where the front of the saddle bars will sit.
Drape the flexible curve over the withers at that spot and press it down so it conforms perfectly to the horse's shape. Carefully lift it off without bending it and lay it flat on your cardboard. Trace the inside of that curve. This gives you the angle and width of the front of the bars.
Step 2: Measuring the gullet vs. the bars
This is where things get a little confusing. People often use "gullet width" and "bar width" interchangeably, but they aren't the same. The gullet is the tunnel under the fork of the saddle. The bars are the pieces attached to the sides of that tunnel.
To measure the bars on a saddle you already have, you want to look at the distance between the two points where the bars actually make contact with the horse.
- Turn the saddle upside down or put it on a stand where you can see underneath.
- Find the "conchos" on the front of the saddle. Usually, the screws for these conchos go directly into the front of the bars (the "tips").
- Measure the distance between these two points.
On a standard Semi-QH bar saddle, this is often around 6.25 to 6.5 inches. For Full-QH bars, you're looking at closer to 6.75 or 7 inches. If you have a draft cross or a very wide mutton-withered horse, you might see measurements upwards of 8 inches.
Step 3: Determining the bar angle
The width is only half the battle. You could have two saddles that both measure 7 inches across, but if one has a steep angle and the other is flat, only one will fit your horse.
Take that cardboard template you made earlier. Hold it up against the underside of the saddle where the bars sit. Does the angle of the template match the angle of the fleece-covered bars?
- If there's a gap at the top: The bars are too wide or the angle is too flat for your horse. The saddle will likely bottom out on the withers.
- If there's a gap at the bottom: The bars are too narrow or the angle is too steep. This will cause painful pressure points on the horse's ribs.
You want "total contact." You want that template to sit flush against the bars from top to bottom.
Don't forget about the "rock" and "flare"
If you really want to know how to measure the bars on a saddle like a pro, you have to look at the profile. The "rock" refers to the curvature of the bars from front to back. A horse with a very flat back needs bars with almost no rock. A horse with a "swayed" back or a significant dip needs more rock.
To check this, place the saddle on your horse (no pad!) and look at it from the side. If the saddle can rock back and forth like a rocking chair, there's too much curve in the bars. This creates a "bridge" effect where all your weight is concentrated in the middle of the horse's back.
On the flip side, if the saddle touches at the very front and the very back but has a big gap in the middle, that's called "bridging." This is just as bad, as it puts all the pressure on the shoulders and the loins.
"Flare" is the way the tips of the bars curve away from the horse at the front and back to allow for movement. Without flare, the bars will dig into the horse's shoulders every time they take a step. While it's hard to "measure" flare with a ruler, you can feel for it by sliding your hand under the front of the saddle while the horse is standing. It should feel like the pressure gradually eases off toward the front edge.
Why "standard" sizes are a myth
It would be so much easier if we could just buy a "Size 7" saddle and be done with it. Unfortunately, because saddle trees are often handmade or made from different molds, a "medium" bar from a barrel racing saddle company might be totally different from a "medium" bar from a trail saddle company.
Also, the thickness of the leather and the density of the sheepskin padding can change how a measurement feels on a horse. This is why using your wire template is so much more reliable than relying on a catalog description. If you're buying a saddle online, ask the seller to hold a tape measure up to the gullet and take a photo, or better yet, ask them to measure the distance between the bar tips (the concho screws).
Testing the fit in motion
Once you think you've got the measurements right, there's one final "measurement" that matters: the sweat pattern. After a good ride, unsaddle your horse and look at the moisture on their back.
You want to see two even strips of sweat where the bars were sitting. If there are dry spots in the middle of a sweaty area, those are high-pressure points where the bars were pressing so hard they shut off the sweat glands. If there's a big dry patch in the center of the back but plenty of sweat at the front and rear, your bars have too much "bridge" and aren't distributing weight properly.
Wrapping it up
Learning how to measure the bars on a saddle is really about developing an eye for shape more than just memorizing numbers. It's about understanding that your horse's back is a dynamic, changing thing. A horse might need a different bar fit as they muscle up in the spring or lose topline in their senior years.
Don't be afraid to get a little "arts and crafts" with your wire and cardboard. It might look a bit silly in the barn, but your horse will definitely thank you when they can move freely without a tree pinching their shoulders. Take your time, trust your hands over the labels, and remember that a good fit is the foundation of everything you do in the saddle.