What is the Difference Between a Single Joint and Double Joint Horse Bit?
When selecting a bit for your horse, one of the first decisions you’ll face is the mouthpiece style. Will you seek a single joint or a double joint mouthpiece for your horse? While they may look similar at a glance, they function quite differently in the horse’s mouth—and choosing the right one can make a big difference in your horse’s comfort and responsiveness.
A single joint bit has one joint in the center, creating a “V” shape when pressure is applied by the reins.
How it works:
When rein pressure is applied, the joint creates a squeeze effect on the horse’s bars.
It can also press into the roof of the mouth, especially in horses with a low palate.
Suits:
Some horses find the single joint action uncomfortable if they are sensitive in the mouth.
A double joint bit features two joints and a center piece (often called a lozenge), which allows the bit to contour to the horse’s mouth.
How it works:
The two joints reduce the squeeze action and distribute pressure more evenly across the tongue and bars.
It offers more precise communication that asks for the horse to carry his head downwards rather than up.
Suits:
There’s no one-size-fits-all answer. Every horse is different in their breeding, conformation, the way they move and preferences. Here’s a quick guide:
| Feature | Single Joint | Double Joint |
|---|---|---|
| Action | Asks the horse to carry head higher | Asks the horse to carry the head lower |
| Contact | Stronger, more direct | Softer, more flexible |
| Tongue pressure | Provides minimal tongue relief. More with curved styles. | Applies tongue pressure. More with straighter styles |
| Jaw or Bar Pressure | Moderate to High | Moderate |
| Ideal for | Heavy horses who require some tongue relief | Horses who may travel head high or inconsistent in single jointed bits |
A bit should allow clear communication without causing pain or confusion. If your horse tosses their head, opens their mouth, or resists the bit, it could be a sign that the mouthpiece isn't right for them. Try both types under guidance and observe your horse's behavior to find the best fit.
Image Credit: Fager Bits
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