Choosing the Right Bit for Your Horse
Part Two: The Mouthpiece
By Tristan Mahoney, TM Bits & Spurs
If the cheek piece is the frame, the mouthpiece is the message. It is arguably the most important component of any bit — the part that determines what your horse actually feels when you pick up the reins.
In over a decade of building bits I have conservatively designed more than a hundred different mouthpiece variations. No two horses are exactly alike, and no single mouthpiece works for every horse. But there are principles that apply broadly, and understanding them will help you make a far more informed decision the next time you're choosing a bit.
How a Mouthpiece Works
Every mouthpiece applies pressure in one or more of three ways: bar pressure, tongue pressure, and palate pressure.
Nearly every mouthpiece applies some degree of bar pressure — so the real question is whether your mouthpiece also engages the tongue, the palate, or both.
As a general rule, snaffle mouthpieces apply tongue pressure while ported bits apply palate pressure. There are exceptions, and there are mouthpieces designed to apply both simultaneously. Here is what each type of pressure actually does:
Bar Pressure is your lateral movement pressure. It communicates direction — telling your horse to move right or left. It is the foundation of most western mouthpiece designs.
Tongue Pressure builds on the lateral communication of bar pressure but adds straight-line and vertical control. The more tongue pressure a mouthpiece applies, the more it encourages collection and vertical softness. This is why most horses transition to a ported bit only after they have developed a solid foundation in a snaffle.
Palate Pressure is the most advanced of the three. When a mouthpiece rolls up and contacts the roof of the horse's mouth, it applies a pressure that is more complex for the horse to process — which is exactly why it is typically reserved for more advanced horses with a well-developed foundation. Used correctly it is a precise and effective tool. Used on the wrong horse at the wrong time, it creates confusion rather than communication.
Four Rules of Thumb
After years of building bits and riding horses at every level of the sport, these four principles apply to most mouthpiece decisions:
1. More breaks mean more lateral flexion. The more joints or breaks in a mouthpiece — a chain, a dog bone snaffle, a three-piece design — the more it encourages lateral bending. If your horse needs to learn how to follow its nose and bend through its body, start here.
2. Higher port means more severity. Port height directly correlates to how much palate pressure a mouthpiece can apply. If you are looking for more vertical control and your horse has the foundation to handle it, increasing port height is often the right next step.
3. Pay attention to the bars. The shape and finish of the bars matters. A horse that is soft and responsive does not need aggressive bars — square or twisted bars apply significantly more bar pressure and are better suited to a horse that is dull or unresponsive to lighter communication.
4. Rollers and prongs apply tongue and palate pressure simultaneously. A port fitted with a roller or downward-pointing prongs will engage both the tongue and the palate at the same time. This does not automatically make it the most severe bit ever built — but it places it toward the higher end of the severity spectrum. Be honest about whether your horse is ready for that level of communication before you make the change.
A Final Thought
This is a broad overview — mouthpiece design goes far deeper than any single blog post can cover. But these fundamentals will point you in the right direction and help you have a more informed conversation about what your horse actually needs.
Next week we will start getting into the specifics — which bit belongs on which horse, at which stage of training, and why.
As always, if you have questions about your horse's current setup, text me directly at 480-459-1411. I am happy to talk through it.
Train hard. Ride TM. Win. #BuiltToWin #tmbitsandspurs
