Design
This bit was originally called the Kimblewick after the English town where it first appeared. However, in its early years of use, it was also known as the "Spanish jumping bit". The "D" ring is offset, so the bit mouthpiece is on the upper part of the flat side of the D, creating a small amount of leverage, supported by a curb chain. This allows the Kimblewick to have a mild curb bit effect.
Like the pelham and curb bits in general, the Kimblewick has bit shanks with purchase arms. However, unlike these other bits, its shanks have no lever arm. Due to the purchase arm and geometry of the rings, the rings may function as very short lever arms and create a small amount of leverage, which puts this type of bit into the pelham or curb bit "family." The curb function varies with the style of bit: slotted Kimblewicks provide the option of more curb action, whereas unslotted Kimblewicks are very close in function to the Baucher bit, which most users regard as a snaffle bit, and to the pelham bit when the snaffle rein is used.
Depending on the position of the rider's hands, the standard Kimblewick has different effects when the rein is allowed to slide freely along the curved portion of the D-ring. If the rider's hands are held high, there is no leverage effect. If the rider's hands are low, the slight leverage effect can be used. However, one popular design, the Uxeter Kimblewick, has slots in the curved portion of the ring, so that the rein may be fixed into one position. This increases the curb effect, especially when the rein is placed on the lower of the two slots.
Kimblewick bits have a variety of bit mouthpieces. The original design has a ported mouthpiece, but it now is also manufactured with others, including a solid, unjointed "mullen" mouth, and a single-jointed mouthpiece
Read more about this topic: Kimblewick (bit)
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