I don't think its a rim issue but a tire problem. Specialized published a go-no go list for its tires as there were definitely fitting issues with some tire and rim combinations. Though I don't recall issues with the Schwinn Super Sport and Record tires that started it all off (Thank You Dave Staub where ever you are!) the later National/Pansonic tires were problematic especially if you were mounting to a rim with a shallow well.
BOB FREITAS
marvelous MILL
VALLEY, CA USA