Conti Gatorskins are puncture resistant and heavier than high end race tires. Good for those that train. Tuffy liners are another means of guarding against punctures, an effective but somewhat dated approach, good for urban commuting. The point is to avoid flats when using those rims.
When others say they had no problem mounting rubber on Elite 19's, I wonder if the manufacturer put them through a retooling. I tried 4 different tires on these rims with limited to no success.