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The curb chain applies pressure to the curb groove under a horse's chin when the curb rein of the bit is used. When the curb rein is pulled, the shank of the bit rotates back towards the chest of the horse and the cheek (upper shank) of the bit rotates forward (since it is a lever arm).f used with a loose curb chain, it allows the shanks to rotate more before the curb chain is tight enough to act as a fulcrum and exert pressure. This extra rotation can warn the horse before pressure is exerted on his mouth, so he may respond beforehand.
I was taught to use it under the chin. Just the lightest jiggle of the lead gets thier attention, you don't shank on them. I have seen several horses at shows with the chain over their nose flip because the owners were shanking them (one was in the concrete barn aisle :eek:). did work Arabs for years-and ALWAYS under the chin-you do not want to leave any bumps or lumps over their delicate profile! The hazard is the flip-over reaction which can and does happen if someone snatches at the shank-or God forbid, the horse steps on it.