New large poly wheel kit comes with #2 9" x 17" Grey poly wheel tires with Stainless steel sealed ball bearings in each wheel; a 37" #606 T-5 solid aluminum ales and is designed for us with large carts # 143, 433 & #686 designed for carrying large loads in soft sand will support #200 lbs. Per wheel inflate to max of 2-4 lbs. Psi.