Spoke hole filler

thingiverse

These two items are for hollow bicycle or wheelchair wheels. The spokes are inset, so inflating the inner tube to high air pressures causes the inner tube to expand into the spoke cut out. These are simply plugs to fill in the spoke cut out space, thus allowing to fill the tire/tube to extreme pressures. Lightweight Wheelchairs typically have tires that inflate to 145 psi or higher. Inflating to more than 100 psi will cause the tube to rupture in the spoke cutouts. Using these plugs prevent the ruptured tube. There is also a spacer here to fill in the extra space around a Presta valve. The wheel is cut out for a Schrader valve, and the Presta valve can easily rupture from the extra space cause by the larger cut out. The valve spacer prevents the Presta valve problem. These items can be printed with a small brim use for build plate adhesion, and just leave the brim on.