Use this tool to calculate Frame Stack and Reach from a desired HX/HY and specific stem configuration.
Stack is the vertical distance from the bottom bracket to the top of the head tube (thorugh its axis). It affects how high/low your handlebars can be positioned relative to the bottom bracket.
Reach is the horizontal distance from the bottom bracket to the top of the head tube (through its axis). It affects how far forward/rearward your handlebars can be positioned relative to the bottom bracket.
1. Enter your desired handlebar position using HX (horizontal) and HY (vertical) coordinates
2. Set your stem configuration including stem height, length, and angle
3. Add spacer height for any components between the frame and stem. This typically includes the headset bearing cover in addition to spacers and any transition pieces that more modern integrated bikes require..
4. Specify the head tube angle of that you desire the frame to have
5. View the calculated Stack and Reach values needed for your frame
The graph shows a mock up of a bike frame with your calculated Stack and Reach point. The red line indicates the top of the frame's head tube, and the dashed lines show the exact Stack and Reach measurements from the coordinate axes.
Use these Stack and Reach values when shopping for frames or comparing bike geometries to find the the closest fit for your desired handlebar position.