register_post_type wheels

// register post_type wheels
function custom_post_init() {
        $labels = array(
      'name'                                => 'Wheels',
            'singular_name'             => 'Wheel',
            'add_new'                           => 'Add new wheel',
            'add_new_item'              => 'Add new wheel',
            'edit_item'                     => 'Edit wheel',
            'new_item'                      => 'New wheel',
            'all_items'                     => 'All wheels',
            'view_item'                     => 'View wheel',
            'search_items'              => 'Search wheels',
            'not_found'                     => 'No wheels',
            'not_found_in_trash'    => 'No wheels in trash',
            'menu_name'                     => 'Wheel'
    );
    $args = array(
      'labels'                              => $labels,
            'public'                                => true,
            'exclude_from_search'       => false,
            'public_queryable'          => true,
            'show_ui'                           => true,
            'show_in_menu'                  => true,
            // 'show_in_admin_bar'      => true,
            // 'query_var'                      => true,
            'rewrite'                           => array( 'slug' => 'wheels', 'feeds' => true ),
            'capability_type'           => 'post',
            'has_archive'                       => true,
            'menu_position'                 => 30,
            // 'menu_icon'                      => url,
            // 'hierarchical'               => false,
            'supports'                          => array('title', 'editor', 'author', 'thumbnail', 'custom-fields','comments'),
            'taxonomies'                        => array('category','post_tag')
    );
    register_post_type( 'wheels', $args );
}
add_action( 'init', 'custom_post_init' );

function add_taxonomy_to_post_type() {
    register_taxonomy_for_object_type('category', 'wheels');
    register_taxonomy_for_object_type('post_tag', 'wheels');
}
add_action('init', 'add_taxonomy_to_post_type');