If you're looking for a new bike and you want to find one that matches your existing geometry, stack and reach become extremely important dimensions for comparing frames however if you're comparing bikes with different headset styles you should be aware that an integrated headset which is one with bearings that fit inside the head tube is going to allow for a much lower stem position than a headset with external bearings in BikeCAD version 18 in addition to the conventional stack and reach dimensions found in the frame tab we now also have stack and reach to the top of the headset these dimensions are found in the Components >> General tab.