When I inquired about these tires, I asked if new bolt in metal valve stems could be installed when the tires were mounted. I was told that it would be no problem. I purchased the tires and scheduled the installation. When I arrived at the installation appointment, I was told that Sam's did not have bolt in valve stems and wouldn't try to get the them. I cancelled the order and purchased the same tires at another tire store that could provide the valve stems that I required. I believe that it is poor customer service to agree to a customer's request and then refuse it after the customer has taken their time to show up for their scheduled appointment. I have purchased numerous sets of tires from Sam's in the past, but will be very hesitant to do so in the future.