Thanks everyone-here you go steve-
I lost almost 1/16" in dia. nothing in width-
Iron Art-I have a vaccum pump that was used when building boats but that was in open molds. I have no experience with closed mold vaccuming,not sure it will work but I may give it a try. Since the molds are flexible the pressure may distort the molds and of course the tire. I do have a bleeder valve and gauge on the pump so I might be able to just have a slight vaccum and not force the liquid out or distort the molds. I may pull a vaccum on the molds just to see how they react. Pugs-the rubber I am using does not have to be degassed. Espeefan-I agree with you. At first I didn't want to mess with this but since this is a scratch build there is a certain satisfaction in making my own tires for the truck.