Why would a tubular be used in a rim that is not concave to fit the contour of the tubular tire? My rims look sorta like l l cross section. Gad zooks! I did expose about 3 inches of the tire and saw the bead but
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no tube. When all the air is out, flat on the bottom, the rest of the tire retains a round shape. Tomorrow I'll see if I can lift the bead and see a tube. No evidence of glue on the inside of the rim. I can say one thing, you just can't "roll" the tire off the rim, I'll have to use tire tools!