A curb bit is a type of bit, which is part of the bridle that goes in the mouth of the horse, that uses lever action. It consists of mouthpiece, curb chain and shank. It has one ring on each side of the purchase arm of the shank and one on the bottom for the lever arm of the shank.
It works on several parts of the horse’s head and mouth, which differs it from the snaffle bit. The bit mouthpiece is the part of a curb bit where the curb chain, shanks and straps are attached. It rests on the bars of the mouth of the horse in the sensitive interdental space where there are no teeth.
It acts on the bars, tongue and roof of the mouth of the horse. The curb chain, which is the flat linked chain or strap, is attached on either side of the mouthpiece near the corners of the mouth. This places pressure from the shank to the chin groove. A curb chain is used to control the lever action of the curb bit.
Also, it helps keep the bit steady and in place within the mouth helping to hold the lip strap in place . The bit shank refers to the side piece or cheekpiece of a curb bit. It adds leverage and place force on the poll through the crownpiece of the bridle. Depending on the length of the curb’s bit shank, the curb can amplify rein pressure several times over.
Shanks are generally made of metal and are designed either straight or curved. Curb bits come in different styles such as Weymouth curb, grazing bit and spade bit, which are the most common types. A Weymouth curb features a straight shank and a solid mouthpiece with a low port. A grazing bit has shanks that are turned back, generally, just about ninety degrees. A spade bit is a vaquero designed curb bit with straight, highly decorated shanks and a mouthpiece with straight bar, a narrow port with cricket and a spoon.
The severity a curb bit can cause relies on several variables, such as the length of the shank. The longer the shank, the more leverage is formed and therefore the more terrible the bit can be. Another variable that may add to the severity is the size of the port, which is the area in the middle of the mouthpiece that is generally slightly raised. The higher the port, the more terrible is the bit.
The tightness or looseness of the curb chain also is affecting the scale of the bit. The tighter the curb chain, the more pressure will be felt by the horse when the rider uses the rein. When the chain is tightened, the shank doesn’t come back as far and more pressure is felt earlier with this adjustment. However, when the curb chain is loose, the shank comes back further when the rider pulls the rein but the horse does not feel the force on the chin area as shortly or as much.
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