Schraeder to Presta Rim Insert
thingiverse
Many tire rims are overly pierced for Schrader valves. When the sharp edge of the rim cuts into the inner tube, it can't be mended. This adapter fills that space with smooth edges to prevent this from occurring. Version A is the standard size, 0.325". Version B is the large, 0.375". Note while attaching the saddle interface to the tire rim: if it doesn't sit all the way down, turn it 90 degrees and try again. I've used commercially available products like those sold at bike stores as illustrations, but some wheels have rims that are too thin for standard 0.325" versions; so, these adaptors have been designed with larger, smoother flanges. Instructions: 100% fill the space Flip it over now to stabilize. Drill out the inside using a 0.234" drill to smooth out the surface.
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