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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.
Chain, as we all know, is the primary link on our karts between the engine to the rear axle sprocket in sprint racing. #35 chain has been used since karting began, and is still used today. 99.9% of four cycle racers generally use #35 chain. Two cycle racers are probably the greater users of #219 chain.#219 chain primarily started in the European countries. The Europeans use either #219 chain or 8mm chain.Japan as well uses #219.n two cycle racing at indoor events, you can achieve 9 more teeth in the rear by using #219 chain and still have the same outside diameter rear sprocket for ground clearance. If using a 9-81 in #35 chain, your ratio is 9 to 1; the same in #219 chain would be a 10-90, which is 9 to 1 also.