western bit rules:
(c) References to a bit in western performance classes mean the
use of a curb bit that has a solid or broken mouthpiece, has shanks
and acts with leverage. All curb bits must be free of mechanical
device and should be considered a standard western bit. A description
of a legal, standard western bit includes:
(1) 8 1/2” (215 mm) maximum length shank to be measured
as indicated in the diagram on page 137. Shanks may be fixed
or loose.
(2) Concerning mouthpieces, bars must be round, oval or
egg shaped, smooth and unwrapped metal of 5/16” to 3/4” (8 mm
to 20 mm) in diameter, measured 1” (25 mm) from the cheek. They
may be inlaid, but must be smooth or latex wrapped. Nothing may
protrude below the mouthpiece (bar), such as extensions or prongs
on solid mouthpieces. The mouthpiece may be two or three pieces.
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A three-piece, connecting ring of 1 1/4” (32 mm) or less in diameter,
or a connecting flat bar of 3/8” to 3/4” (10mm to 20 mm) measured
top to bottom with a maximum length of 2” (50 mm), which
lies flat in the horse’s mouth, is acceptable.
(3) The port must be no higher than 3 1/2” (90 mm) maximum,
with rollers and covers acceptable. Broken mouthpieces, halfbreeds
and spades are standard.
(4) Slip or gag bits, and donut and flat polo mouthpieces
are not acceptable
