What is the difference between a ported, single-jointed and double-jointed bit?

One of the most common questions when choosing a bit is: what exactly is the difference between a single-jointed, double-jointed and a ported bit? Many riders use the same type of bit for years without fully understanding how it works in the horse's mouth. However, the right bit can make a significant difference in comfort, acceptance of the contact and overall rideability.

In this blog, we explain the differences between these three popular mouthpiece designs. As an example, we use an eggbutt snaffle, as it is one of the most commonly used bits worldwide. The difference lies not in the rings, but primarily in the mouthpiece.

What is an eggbutt snaffle?

An eggbutt snaffle is a bit with fixed rings. Unlike a loose ring snaffle, the rings do not rotate freely. As a result, an eggbutt snaffle generally sits more steadily and quietly in the horse's mouth.

Advantages of an eggbutt snaffle:

• Stable position in the mouth
• Reduced risk of pinching the corners of the mouth
• Slightly more direct aids
• Suitable for many horses and disciplines

An eggbutt snaffle can be fitted with various mouthpieces, including single-jointed, double-jointed or ported designs.

How does a single-jointed eggbutt snaffle work?

A single-jointed bit consists of two sections connected by one central joint.

When the rider takes up the reins, the bit creates a so-called nutcracker effect. The mouthpiece closes slightly around the horse's lower jaw.

Action of a single-jointed bit

The pressure is mainly distributed over:

• The tongue
• The bars of the mouth
• In some cases, the palate

Horses with a low palate can be particularly sensitive to a single-jointed bit. When stronger rein pressure is applied, the center of the bit may move upward toward the roof of the mouth.

Advantages

• Clear and direct communication
• Many horses understand the action well
• Relatively simple design

Possible disadvantages

• Can create pressure on the palate
• Less even pressure distribution
• Some horses become strong or unsettled in the contact

Suitable for

• Horses that prefer clearer aids
• Horses with sufficient room in the mouth
• Riders who prefer a direct connection

How does a double-jointed eggbutt snaffle work?

A double-jointed bit consists of three sections. Between the two joints is a central link.

Because the mouthpiece has three sections, it does not create the same nutcracker effect as a single-jointed bit.

Action of a double-jointed bit

The pressure is distributed more evenly across:

• The tongue
• The bars
• The corners of the mouth

The center link follows the shape of the horse's mouth more closely, making it a comfortable option for many horses.

Advantages

• Even pressure distribution
• Reduced pressure on the palate
• Often better accepted by sensitive horses
• Encourages a steady contact

Possible disadvantages

• Some horses may find the aids less distinct
• May provide less limitation for horses that lean heavily on the bit

Suitable for

• Young horses
• Sensitive horses
• Horses that struggle with a single-jointed bit
• Riders seeking a softer connection

How does a ported bit work?

A ported bit features a curved section in the center of the mouthpiece, creating additional room for the tongue.

The tongue is a highly sensitive organ. With many traditional bits, a significant amount of pressure is placed directly on the tongue. A ported bit reduces this pressure and provides greater tongue relief.

Action of a ported bit

Because of the port:

• More room is created for the tongue
• Some pressure is transferred to the bars
• The horse may find it easier to swallow and relax

Horses with a thick tongue or limited space in the mouth often respond positively to this additional tongue relief.

Advantages

• Greater comfort for horses with a sensitive or thick tongue
• Reduced tongue pressure
• Many horses become softer and more willing to accept the contact
• May reduce tension and fussiness in the mouth

Possible disadvantages

• Not every horse enjoys reduced tongue contact
• Some horses may become stronger
• A port that is too high can increase pressure on the bars

Suitable for

• Horses that play excessively with their tongue
• Horses that stick their tongue out
• Horses that go behind the contact due to tongue pressure
• Horses with limited space in the mouth
• Sensitive sport horses

Which bit is the softest?

A common misconception is that bits can simply be classified as soft or severe.

In reality, the effect of a bit depends on several factors:

• The horse's anatomy
• The thickness of the tongue
• The available space in the mouth
• The rider's hands
• The fit of the bit

A ported bit is not automatically softer than a double-jointed bit. For a horse that prefers tongue contact, a ported bit may actually feel less comfortable. Conversely, a horse with a thick tongue may benefit greatly from the extra space provided by a port.

How can you tell if a bit is not the best fit?

Look for signs such as:

• Sticking the tongue out
• Excessive chewing
• Opening the mouth
• Head tossing
• Going behind the contact
• Pulling against the bit
• Difficulty yielding
• Unsteady contact

These signs do not automatically mean that the bit is unsuitable, but they may indicate that another mouthpiece design would be more comfortable.

Our experience

In practice, we find that a double-jointed eggbutt snaffle is a safe and comfortable choice for many horses. This is one of the reasons why it remains so popular.

A single-jointed eggbutt snaffle is often chosen for horses that benefit from slightly clearer rein aids.

A ported bit is frequently used for horses that are sensitive to tongue pressure, have limited space in the mouth or struggle with more traditional mouthpieces. Modern anatomical bits with a low port have become particularly popular in recent years.

Conclusion

There is no universally "best" bit. The ideal bit is the one that best suits your horse's anatomy and your style of riding.

In summary:

Mouthpiece Type	Pressure Distribution	Main Characteristic
Single-jointed	More concentrated	Clear aids, nutcracker effect
Double-jointed	Evenly distributed	Comfortable and versatile
Ported	Less pressure on the tongue	More tongue relief and relaxation

 

If you are unsure which bit is best for your horse, it is important not only to look at your horse's behaviour under saddle but also at the anatomy of the mouth. A well-fitting bit can lead to greater relaxation, a steadier contact and ultimately a more enjoyable riding experience for both horse and rider.