reach

Saddle to handlebar reach is defined as the distance from the tip of the saddle to the center of the handlebar. This measurement is also available as the horizontal component of this distance and also the distance from the tip of the saddle to the back edge of the handlebar.

Stack is the vertical distance from the center of the bottom bracket to the top of the head tube. The horizontal counterpart to Stack is Reach.

Reach is the horizontal distance from the center of the bottom bracket to the top of the head tube. The vertical counterpart to Reach is Stack.