"A curb bit is a type of bit used for riding horses that uses lever action. It includes the pelham bit and the Weymouth curb along ...
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with the traditional "curb bit" used mainly by Western riders.
Kimblewicks or "Kimberwickes" are modified curb bits, and a curb bit is used in a double bridle along with a bradoon. A curb bit is, in general, more severe than a basic snaffle bit, although there are several factors that are involved in determining a bit´s severity. Liverpool bits are a type of curb bit commonly used for horses in harness." - (en.wikipedia.org 23.09.2020)