Sole structure for article of footwear

An article of footwear, comprising:

• a midsole having a medial edge and a lateral edge;
• and
• an outsole coupled to the midsole, the outsole including:
• a chassis secured to the midsole;
• and
• a lower rib extending from the medial edge of the midsole to the lateral edge of the midsole, the lower rib including a first distal end at or adjacent the medial edge and a second distal end at or adjacent the lateral edge,
• wherein the lower rib is configured such that, in response to a shear force, the first distal end or the second distal end flexes toward the chassis and the other of the first distal end and second distal end flexes away from the chassis.

An article of footwear, comprising:

• a midsole having a medial edge and a lateral edge;
• and
• an outsole coupled to the midsole, the outsole including:
• a chassis secured to the midsole;
• and
• a lower rib extending from the medial edge of the midsole to the lateral edge of the midsole, the lower rib including an inner surface facing the chassis and an outer surface opposite the inner surface configured to engage a ground surface,
• wherein the inner surface of the lower rib is convex relative to the chassis and the outer surface of the lower rib is concave relative to the chassis.