A sole member for an article of footwear is provided, wherein the sole member comprises ground-engaging members attached to a forefoot portion of the sole member and ground-engaging members attached to a heel portion of the sole member; a torsion bar having an exposed intermediate portion attached at a forefoot end to a forefoot socket in the forefoot portion of the sole member and at a heel end to a heel socket in the heel portion of the sole member; a first hollow component having a bore positioned between the forefoot socket and the heel socket; said first hollow component receiving the torsion bar, wherein the torsion bar is free to rotate within the bore; and at least one rib extending from the first hollow component to the sole member.