Remove WP Admin Menu Items by User Role

function shapeSpace_remove_toolbar_menu() {
    global $wp_admin_bar;
    // remove menu for editor and author        
    if( current_user_can( 'editor' ) || current_user_can( 'author' )  ){
         $wp_admin_bar->remove_menu('site-name');
       }
 }
add_action('wp_before_admin_bar_render', 'shapeSpace_remove_toolbar_menu', 999);

All Roles:

current_user_can( 'administrator' )
current_user_can( 'editor' )
current_user_can( 'author' )
current_user_can( 'contributor' )
current_user_can( 'subscriber' )