Originally Posted by
cpt. Howdy
Every time I try to true a wheel with pressure in the tire, I break the spoke and pop the tube.
Every time.
This can happen if with single wall rims and rubber rim strips. When the tire is highly inflated, it puts a lot of pressure against the underside of the tube and the outside of the rim strip. The sharp slotted head of the nipple acts like a drill against the underside of the rim strip, boring a hole into it and through to the tube. The Not sure if this is your situation or not.