TrickRoperDeluxe wrote:

I think this is a solid case of people not knowing the mechanics of a device enough to have a real opinion on it.
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Correct, a snaffle with a medium size chain mouthpiece is not as harsh as a single break snaffle that has a nutcracker effect. As the chain mouthpiece works lightly on the bars and corners of lips while adding some tongue pressure. It gives a horse more bend than a single break does with less direct pressure on just the bars like the single break mouthpiece as there's more uniform pressure in more areas to give relief as opposed to only one area of pressure.

Unlike regular smooth rolled chain, the bicycle chain mouthpiece has thin edges on the links making it cut into the horses mouth on the tongue, bars & corner of the lips.It's noted for being one of the harshest bits to use on a horse.