LOCATING THE BEADLOCK TUBE VALVE STEM HOLE
BLIN-4 Rev05
Problem: How do I determine the best location for the Coyote Enterprise Dual, Internal, Pneumatic, Boltless, Beadlock inner tube valve stem hole?
Solution: A) To determine the “perfect” inner tube valve stem hole location, mount the tube on the flat lying rim, valve stem up (toward the outside of the rim), about 6 to 8 inches (150 to 200mm) clockwise from the standard valve stem hole. Then inflate the tube to take shape. Do not over inflate. Valve stem distortion is expected and will not hurt the inner tube.
B) Center the tube vertically on the rim, then mark the valve stem location. Finally, since this is not always a practical location, “optimize” that location to accommodate your rims as described in the next paragraph.
The inner tube valve stem hole requires that both the outer (lug-nut side) and inner (air side) rim surfaces be parallel (green) or on a minimal curve (orange) as shown here. This accommodates the inner and outer, all-thread valve stem O-rings. Also, the surfaces should be around ¼-inch (~4mm) thick, maximum. When counter boring, it mab be as thin as 3/32-inch (~2.4mm) thick. Your objective, once installed, it must be accessible to both an air chuck and a tire pressure gauge.
+ You may have to counterbore both the inside and outside to achieve the close-together, parallel surfaces.
Remove most of the “thickness” from the outside to avoid a deep, sharp-cornered inner counterbore. This is where the inner tube valve stem must seat, nest into. Use rotary and hand files to groom this sharp corner as smooth as possible. This collage makes counterbore recommendations and offers more advice.
IMPORTANT: 1) Before drilling a hole on the inside (brake) of the rim, be completely sure that there will be no interference between brake components (caliper, disc, etc.) and the beadlock tube valve stem.
With a 1-inch piece of regular wood pencil or similar dowel, stick it with chewing gum/putty to the potential hole location on the wheel. Mount and rotate the wheel to make sure that it does not interfere with any brake or other inboard components and that you can get a standard air chuck and tire pressure gauge on the stem. Do not just test one wheel position. Test all four wheel locations.
2) DO NOT drill the 5/16-inch (8mm) valve stem hole and then try to use the counterbore. Use the counterbore first and then enlarge the pilot hole to 5/16-inch (8mm).
This page best printed in color.
C) Another option is to weld up the original valve stem hole and locate both valve stems in a well-protected, inside location as seen in this competition rock crawler, but remember to check for any potential brake component interference first.
Note the welded original hole.
I want every Coyote beadlock owner to experience the full performance capabilities of our products. I’m always available to answer your questions and encourage your calls (949 645-7733) and emails Harry@coyoteents.com. Let us know what’s going on!
