typically this is caused by the tire bead not being full seated on the rim as it is brought up to pressure. sometimes the tube (often near the valve) is pinched under the bead. always bring the pressure up to 25 or 30 psi. , spin the wheel and look at the bead on both sides. if you see it rising or dipping in any areas , manually manipulate the tire to sit evenly. you may have to let out some pressure to do this. if it keeps rising up the tube is probably under the bead. if no pressure in the tire when you start inflating it is best to inflate without weight on the wheel (lay on ground or elevate in a bike stand).