It is VERY important to position the rim lock and valve stem 4 spokes apart, or you will damage the bladder during tire changes. Make sure to smooth any sharp edges on spoke nipples and around the outer lip of the rim. NOTE that the rim tape does NOT seal in any way; it only acts as a cushion between the spoke nipples and the bladder. It is important to understand that the SEAL is formed between the bead of the RED liner and the INSIDE of the tire’s bead. The drop-center of the rim is NOT pressurized at all.