Bottom Bracket Height
The bottom bracket height is the vertical distance from the center of the bottom bracket to the ground, and it expresses clearance of the frame over obstacles. The height of the bottom bracket is of concern when designing the frame. The height of the bottom bracket is the baseline for the rider's height while riding. Combined with the length of the cranks, it determines the bicycle's ground clearance.
A higher bottom bracket is useful for mountain bikes. In a fixed-gear bicycle, the bottom bracket should be high enough to prevent the pedals from coming in contact with the ground while cornering.
A lower bottom bracket creates a lower center of gravity and allows for a larger frame without creating an uncomfortable standover height.
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—William Shakespeare (1564–1616)
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—Henry David Thoreau (1817–1862)