Golf club heads with stiffening ribs

A golf club head comprising:

• a first component adhered to a second component to define a closed interior volume therebetween, the golf club head comprises a strikeface configured to strike a golf ball, a rear portion opposite the strikeface, a crown, a sole opposite the crown, a heel end, and a toe end opposite the heel end;
• wherein the first component comprises:
• a crown return extending rearwardly from the strikeface, the crown return forming a portion of the crown;
• a sole return extending rearwardly from the strikeface, the sole return forming a portion of the sole;
• a sole extension extending rearwardly from the sole return and forming a portion of the sole;
• a back rail connected to the sole extension;
• a skit connected to the back rail;
• and
• a crown bridge that is integrally formed with the crown return and the back rail and extends in a strikeface-to-rear portion direction;
• and
• a rib positioned on an interior surface of the sole extension;
• wherein the back rail comprises a top wall, a rear wall, and a lip;
• wherein the top wall, the rear wall, and the lip together define a channel extending along the back rail in a heel to toe direction;
• wherein the rib comprises a lower front end point, a lower rear end point, an upper rear end point a bottom edge, adjacent an interior surface of the sole portion, and a top edge, opposite the bottom edge;
• and
• wherein a rib height, measured as the distance from the interior surface to the top edge, varies between the lower front end point and the lower rear end point;
• wherein the second component comprises:
• a crown portion;
• a heel side wing that extends from the crown portion to the sole around the heel end of the golf club head;
• a toe side wing that extends from the crown portion to the sole around the toe end of the golf club head;
• wherein the sole extension extends a greater distance away from the strikeface, as measured in a direction from the strikeface to the rear, than the crown return;
• wherein the channel is configured to receive a weight portion of at least 14 grams;
• wherein the first component comprises approximately 85%-90% of an overall mass of the golf club head;
• and
• wherein a rib is positioned on an interior surface of the closed interior volume of the golf club head extending in a front-to-rear direction.