Pin for a crown of a bicycle crankset , the pin comprising: - a mounting portion extending along a longitudinal axis (X) of the pin and configured to be fixed to said crown , said mounting portion having a first dimension along a transversal direction (Y) perpendicular to said longitudinal axis (X); - a chain engaging portion associated with said mounting portion and having a second dimension greater than said first dimension along said transversal direction (Y); wherein said chain engaging portion comprises a first face facing towards said mounting portion and configured to engage a plate of a link of a bicycle chain , and a second face facing on the opposite way with respect to said mounting portion ; wherein said second face comprises at least one first surface portion inclined with respect to said longitudinal axis (X) by a first angle smaller than 90°, said first angle being measured in a longitudinal section plane of the pin that contains said longitudinal axis (X) and is perpendicular to said transversal direction (Y); wherein said first face comprises an abutment surface configured to abut against said crown , wherein said mounting portion extends along said longitudinal axis (X) from said abutment surface ; and characterized in that said chain engaging portion is configured to ensure the desired orientation of said at least one first surface portion with respect to said crown when said mounting portion is fixed to said crown and the pin comprises one of features a) or b) or c) below: a) an anti-rotation abutment surface portion defined on said first face and configured to cooperate with a matching anti-rotation abutment surface portion formed on said crown when said mounting portion is fixed to said crown , or b) a pin extending canti-levered, parallel to the longitudinal axis (X), from said abutment surface and configured to engage in a corresponding recess formed on the crown close to a housing seat of the pin in the crown , or c) the chain engaging portion comprising an anti-rotation abutment surface portion lying on a plane substantially parallel to the longitudinal axis (X) and configured to engage in a corresponding anti-rotation abutment surface portion formed on a housing seat of the pin in the crown and lying on a plane substantially parallel to a rotation axis of the crown . - a mounting portion extending along a longitudinal axis (X) of the pin and configured to be fixed to said crown , said mounting portion having a first dimension along a transversal direction (Y) perpendicular to said longitudinal axis (X); - a chain engaging portion associated with said mounting portion and having a second dimension greater than said first dimension along said transversal direction (Y); a) an anti-rotation abutment surface portion defined on said first face and configured to cooperate with a matching anti-rotation abutment surface portion formed on said crown when said mounting portion is fixed to said crown , or b) a pin extending canti-levered, parallel to the longitudinal axis (X), from said abutment surface and configured to engage in a corresponding recess formed on the crown close to a housing seat of the pin in the crown , or c) the chain engaging portion comprising an anti-rotation abutment surface portion lying on a plane substantially parallel to the longitudinal axis (X) and configured to engage in a corresponding anti-rotation abutment surface portion formed on a housing seat of the pin in the crown and lying on a plane substantially parallel to a rotation axis of the crown . <EOS>