Big Bore Tubeless Setup Guide 2/4: Valve Instalation - Grab your Big Bore Tubeless Valves - Remove ball valve body, cap, locking ring, and O-ring from the valve stem - Select correct rubber base for your rim type and slide it to the bottom of the valve stem - Pierce a small hole in the rim tape over the valve hole - Push the valve stem through and slide the O-ring down to meet the rim - Screw the locking ring onto the stem, tightening it above the O-ring to secure it between the ring and the rim