Trailer Rim and Tyre Complete 520/500 x 10 inch 6 Ply 4 x 4 inch PCD White. Please note all images are for illustrative purposes. Trailer Rim and Tyre Complete 520/500 x 10 inch 6 Ply 4 x 4 inch PCD White x 4. Rim PCD (Pitch Circle Diameter). If you are outside the U.Thank You Discount Towing Supplies. Download / View Fitting Instructions. If you wish to return an item to us please follow the below steps. Send the item or items back to the address provided. We can provide either a Collection service through our courier or a parcel drop off service. Powered by SixBit's eCommerce Solution.