ffdg,
They should come with a fill connector. It is just a little nipple that you connect to the tires valve. You can blow enough air to fill them. I chose to leave them underinflated. It stops the bounce and even looks scale at the field. I just put the tires on the plane set it on my plane stand, inserted the nipple to fill the tires and instead of putting air in, I mashed the air out. It is real easy to do. Hope this helps.
Stangevil29