Choosing the Right Bit for Your Horse — Part 2: The Mouthpiece | TM Bits & Spurs

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

Choosing the Right Bit for Your Horse Part 1

Part One: Understanding the Cheek Piece

By Tristan Mahoney, TM Bits & Spurs

Before you can choose the right bit for your horse, you need to understand how a bit actually works. Not just what it looks like — but what it does, and why. This series is going to break that down piece by piece, starting with the foundation of every western performance bit: the cheek piece.

The Two Parts of a Cheek Piece

Every cheek piece is made up of two elements — the purchase and the shank.

The purchase is measured from the top of the headstall ring down to the top of the mouthpiece. The shank is measured from the bottom of the mouthpiece down to the bottom of the rein ring.

These two elements work together, and understanding the relationship between them is the key to understanding why one bit feels completely different from another — even when they look nearly identical at a glance.

The 1:2 Ratio — A Proven Starting Point

The most common cheek piece we build here at TM has a 2.5" purchase and a 5" shank. That's a 1:2 purchase-to-shank ratio.

We didn't invent this. Horsemen have been arriving at this ratio for centuries because it works. It's balanced, it's responsive without being abrupt, and it gives most horses and riders a feel that communicates clearly without creating anxiety. It's our baseline — and it's a baseline for good reason.

But it isn't the only answer. It's just the starting point.

What Happens When You Change the Ratio

To understand how changing the purchase or shank affects the feel, think of the mouthpiece as a pivot point. Everything above it and below it is rotating around that center when you pick up the reins.

A shorter purchase speeds everything up. The mouthpiece and curb chain engage more quickly when the reins are lifted, and when the bit is fully engaged the rein ring travels further back — giving the rider more leverage and a quicker, more direct response. This is the right setup for a horse that needs a faster, cleaner signal.

A longer purchase does the opposite. Engagement is slower and more gradual, the rein ring doesn't travel as far back when fully engaged, and the overall feel is softer and more mild. This works well for a horse that's sensitive, still developing, or one that a rider wants to ride with a lighter, more progressive touch.

Same mouthpiece. Same basic design. Completely different conversation with your horse — just by changing the length of the purchase.

Why This Matters

Most riders pick a bit based on what it looks like or what someone else is riding. The best riders pick a bit based on what their horse needs to hear — and then they find the geometry that delivers that message most clearly.

That's what this series is about. Not what's popular. Not what wins on looks. What works for your horse.