An article of footwear, comprising: a sole structure (110, 1710) having a first side (250, 1750) and a second side (252, 1752), the sole structure (110, 1710) having a cleat receiving portion (204, 960, 1502), the cleat receiving portion (204, 960, 1502) including a first cavity that extends through the sole structure (110, 1710); a removable cleat member (213, 950, 1500, 1600) configured to engage the cleat receiving portion (204, 1502) on the second side (252, 1752) of the sole structure (110, 1710), the removable cleat member (213, 950, 1500, 1600) including a second cavity (353, 1602, 1604) that does not extend through the cleat member (213, 950, 1500, 1600); a fastener (206, 233) inserted through the first cavity from the first side (250, 1750) to the second side (252, 1752) of the sole structure (110, 1710) and into the second cavity (353, 1602, 1604), thereby releasably securing the removable cleat member (213, 950, 1500, 1600) to the sole structure (110, 1710); a radial locking system, comprising: a first plurality of radial locking elements (962, 1520, 1522) disposed on a first engaging surface of the cleat receiving portion (204, 960, 1502); a second plurality of radial locking elements (952, 1510) disposed on a second engaging surface of the removable cleat member (213, 950, 1500, 1600); wherein the first plurality of radial locking elements (962, 1520, 1522) engages the second plurality of radial locking elements (952, 1510) when the second engaging surface of the removable cleat member (213, 950, 1500, 1600) is disposed against the first engaging surface of the cleat receiving portion (204, 960, 1502); and wherein the radial locking system prevents rotation of the cleat about a central axis of the removable cleat member (213, 950, 1500, 1600), while the removable cleat member (213, 950, 1500, 1600) is fastened to the sole member. a sole structure (110, 1710) having a first side (250, 1750) and a second side (252, 1752), the sole structure (110, 1710) having a cleat receiving portion (204, 960, 1502), the cleat receiving portion (204, 960, 1502) including a first cavity that extends through the sole structure (110, 1710); a removable cleat member (213, 950, 1500, 1600) configured to engage the cleat receiving portion (204, 1502) on the second side (252, 1752) of the sole structure (110, 1710), the removable cleat member (213, 950, 1500, 1600) including a second cavity (353, 1602, 1604) that does not extend through the cleat member (213, 950, 1500, 1600); a fastener (206, 233) inserted through the first cavity from the first side (250, 1750) to the second side (252, 1752) of the sole structure (110, 1710) and into the second cavity (353, 1602, 1604), thereby releasably securing the removable cleat member (213, 950, 1500, 1600) to the sole structure (110, 1710); a radial locking system, comprising: a first plurality of radial locking elements (962, 1520, 1522) disposed on a first engaging surface of the cleat receiving portion (204, 960, 1502); a second plurality of radial locking elements (952, 1510) disposed on a second engaging surface of the removable cleat member (213, 950, 1500, 1600); a first plurality of radial locking elements (962, 1520, 1522) disposed on a first engaging surface of the cleat receiving portion (204, 960, 1502); a second plurality of radial locking elements (952, 1510) disposed on a second engaging surface of the removable cleat member (213, 950, 1500, 1600); wherein the first plurality of radial locking elements (962, 1520, 1522) engages the second plurality of radial locking elements (952, 1510) when the second engaging surface of the removable cleat member (213, 950, 1500, 1600) is disposed against the first engaging surface of the cleat receiving portion (204, 960, 1502); and wherein the radial locking system prevents rotation of the cleat about a central axis of the removable cleat member (213, 950, 1500, 1600), while the removable cleat member (213, 950, 1500, 1600) is fastened to the sole member.