Sole structures and/or articles of footwear having expandable lugs for engaging footwear components

A method of assembling an article of footwear, comprising:

• providing an upper component having a plurality of through hole openings;
• providing a foot support component having a first surface, wherein the foot support component is shaped to form a plurality of receptacles, each receptacle having an interior chamber, and wherein a plurality of openings are defined at the first surface providing access to a corresponding interior chamber;
• providing an inflatable bladder having:
• (i) a first sheet for supporting at least a portion of a plantar surface of a wearer's foot, (ii) a second sheet opposite the first sheet, and (iii) a plurality of inflatable lugs extending from the second sheet, wherein a fluid chamber is defined between the first sheet and the second sheet and within the plurality of inflatable lugs;
• with the fluid chamber in a first pressure condition, positioning the second sheet of the inflatable bladder with respect to the upper component such that the plurality of inflatable lugs extend through corresponding through hole openings of the upper component and into corresponding receptacles of the plurality of receptacles;
• and
• with the plurality of inflatable lugs extending into corresponding receptacles, introducing gas into the fluid chamber to change the fluid chamber to a second pressure condition, wherein the second pressure condition is at a higher pressure than the first pressure condition, and wherein the step of introducing the gas into the fluid chamber changes a size and/or shape and/or rigidity of the plurality of inflatable lugs such that the plurality of inflatable lugs are inhibited from pulling out of their corresponding receptacles.