1. Locate position for the inner tube valve stem hole:
To determine the “perfect” inner tube valve stem hole location, put the tube on the flat lying rim (no tire), valve stem up (toward the outside of the rim), about 150 to 200mm (6 to 8 inches) clockwise from the standard valve stem hole and then inflate the tube to just take shape. Valve stem distortion is expected, but that will not hurt the inner tube. Center the tube vertically on the wheel and mark the valve stem location. Finally, since this is not always a practical location, “optimize” that location to accommodate your rims. If the inner tube valve stem is located inboard (brake side) of the wheel, it must not interfere with the brakes and associated components. Ensure that the proposed tube valve stem hole surfaces are flat, parallel and less than 13mm (1/2”) thick. This is to accommodate both the inner and outer inner tube valve stem O-rings.
2. Drill and chamfer the tube valve stem hole:
Center punch and drill an 8 mm (5/16”) hole at the chosen position. Chamfer the drop center side of this hole to receive the smaller, inner O-ring. The chamfer face should be 1 to 1.5 mm (0.040 to 0.060”) wide. It is very important to clean all metal chips off the wheel,all bead lock components and from within the tire. Chips can cause tube failure.
3. Prepare the rims:
For new rims, skip to step 4. For used rims, carefully inspect 100% of the rim’s inside and outside ODs for any sort of blemish or rock rash. The wheels should be clean and free from all rough edges to ensure that the tube is not damaged during installation. Smooth as necessary. All labels, their adhesives and rust should be removed from the rims, too.
4. Prepare the tires:
The inside edges of tire beads are very sharp. Sometimes, they are too wide to fit fully behind the bead bump. In mounting the final tire bead, you may also pinch the inner tube. As a result, the inside edges of the tire beads must be slightly rounded. This is a very important step! We recommend using a #40 grit, 2 inch diameter sanding drum. All tire bead inside edges must be smoothed.
5. Powder all components:
Powder the bead lock case, inner tube, Air Channel and the rim’s drop center. Pay particular attention to the inside and outside of both bead lock case Beads (the black webbing at the inner diameter of the case Sidewalls). Powder the components inside the tire to contain the powder.