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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.
The chain can be tightened when the bike is on the side stand but a center stand allows you to judge balance of the rear wheel better. Differences in slack can also be a problem when adjusting a chain using the side stand compared to a center stand.anually run the chain by spinning the back wheel slowly and use a rag to rub the chain clean. Chains should always stay lubricated so make sure after cleaning that it runs smoothly. Measure the slack in the chain. The manufacturer's manual should have a section on the correct tension limits for the chain.