A shanked bit is any bit that incorporates a shank — a vertical arm extending below the mouthpiece — to create leverage. Unlike direct-pressure bits such as the snaffle, shanked bits work on a leverage principle: when the rider applies rein pressure, the shank rotates and amplifies the signal through the curb chain or strap under the horse’s jaw, creating pressure on multiple points simultaneously.
How a Shanked Bit Works
The mechanics of a shanked bit are more complex than those of a simple snaffle. The shank acts as a lever with three points of action: the mouthpiece acts on the bars, tongue, and palate; the curb chain or strap presses against the chin groove; and the poll piece applies pressure to the top of the horse’s head. The ratio between the purchase (the arm above the mouthpiece) and the shank (below) determines the degree of leverage — a longer shank produces more amplified pressure.
This leverage effect means shanked bits require considerably lighter hand pressure than direct-pressure bits to produce the same response. A horse trained to a well-fitted shanked bit will respond to the lightest rein movement, making it the ideal choice for advanced Western performance work where neck reining and single-handed riding are standard.
Types of Shanked Bits
Shanked bits encompass a wide range of designs, most falling into the curb bit category:
- Western curb bit: The most common shanked bit, used in Western riding disciplines including reining, cutting, and trail. Shanks are typically swept back, fixed or loose, with a variety of mouthpiece options.
- Weymouth (double bridle curb): The English equivalent used in dressage at higher levels. A relatively mild shanked bit used in combination with a bradoon snaffle.
- Pelham: A single-bitted compromise that combines snaffle and curb action via two reins. Often used in show jumping and showing.
- Kimblewick: A mild shanked bit with limited leverage, popular in show jumping and with stronger horses.
Mouthpiece Variations
The mouthpiece of a shanked bit significantly affects its severity. A low, straight port applies gentle tongue pressure; a high port allows tongue relief but increases palate pressure if the horse overflexes. A solid (unjointed) mouthpiece distributes pressure more evenly across the bars, while a jointed mouthpiece creates a more focused, pinching action. Copper or sweet iron mouthpieces encourage salivation and acceptance.
When to Use a Shanked Bit
Shanked bits are typically reserved for horses that have completed their foundational training in a snaffle and are ready for more subtle, refined communication. In Western riding, the progression from snaffle to shanked bit marks a significant milestone in a horse’s development. Introducing a shank too early — before the horse understands yielding to pressure — can create resistance, tension, or mouth damage. See bitting for guidance on bit selection and progression.
Correct curb chain fit is critical. A curb chain that is too tight will activate prematurely and cause discomfort; one that is too loose renders the bit ineffective. The chain should lie flat in the chin groove and allow approximately two fingers’ width when the shanks are at 45 degrees.
Frequently Asked Questions
Are shanked bits harsher than snaffle bits?
In the wrong hands, yes — but it is the leverage that makes them more sensitive, not inherently harsher. A well-trained horse ridden by a skilled rider with light hands will find a correctly fitted shanked bit entirely comfortable. The issue arises when shanked bits are used with heavy hands, poor fit, or on horses that are not ready for the extra communication.
Can shanked bits be used in English disciplines?
Yes. The Weymouth curb, Pelham, and Kimblewick are all shanked bits used across English disciplines, particularly dressage, showing, and show jumping. The double bridle, which combines a Weymouth with a bradoon, is mandatory for Grand Prix dressage under FEI rules.
What is the difference between a fixed and a loose shank?
A fixed (solid) shank activates immediately and directly when the rein is moved. A loose shank has a small amount of play before activation, giving the horse a moment of warning before pressure is applied. Loose shanks are generally considered slightly more forgiving for horses in early curb bit training.