WB468 WHEELBARROW TIRE, 4.80/4.00 X 8" | #WB-436 has 3 in hub length and 445 lb load rating. #WB-438 has 3 in hub length and 500 lb load rating. #WB-466 has 6 in hub length and 445 lb load rating. #WB-468 has 6 in hub length and 500 lb load rating.