I'm sure that others here will chime in, but as far as I know, you should be OK. The down tube sees mostly extension (tensile?)forces (as opposed to compression) and some rotational (twisting) forces. As long as the ding isn't very large, you should be OK.DrLeah said:sob!!
I was cleaning my baby blur tonight and noticed that the down tube has a DENT in it! It's on the left side, just at the bottom of the "T" of santacruz.
The edges and deepest part of the dent are smooth and the ano finish seems ok.
Should I be worried or just continue to cry??
I remember seeing a bike once that had a cable in place of a down tube. That was a big indicator that the down tube sees mostly extension (tensile) forces.
I would be a good idea to have the LBS take a quick look at the bike just to be safe.