Originally posted by pokey
Usually no prob,,but there could be with really high pressure tires where the pressure could force the tube into the larger gap where the stem goes thru the rim,but there are gromets that make them fit better and fill the gap.
This is one of my more common tube failures even w/my rims drilled for prestas. Presta pump heads generally fit pretty snugly, and it's easy to damage the stem/tube right at the hole while removing the pump head.