Overcheck
（重定向自Checkrein）
![A modern harness with an overcheck rein, visible along the neck of the horse](/Images/godic/202501/04/Fast_moving_buggy2019.jpg")
![Head shot of an overcheck on a harness racing horse, with separate bit](/Images/godic/202501/04/ThaiTanic2019.jpg")
![An overcheck used on a harness racing horse.](/Images/godic/202501/04/Deauville-Clairefontaine_Pierre_Lévesque2019.jpg")
![](/Images/godic/202501/04/Wiener_Gewerbewappen_Sattler2019.jpg")
A bearing rein, known today as an overcheck or a checkrein, is a piece of horse tack that runs from a point on the horse's back, over the head, to a bit. It is used to prevent the horse from lowering its head beyond a fixed point. A variation called a side check passes beside the ears through loops at the top of the bridle cheekpieces.