I bought it this way without the seller noting the issue, so experience from riding with these is zero. Rims are Ritchey Girder OCRs. The crack is pretty small, but noticeable, and I will be running Maxxis DTHs on it, so I will pretty much load the inner tube with 70-80 psi or maybe even more. The crack runs unto the inside of the rim. The brake surface is still thick and deep and I doubt that it's worn out its lifespan.
I just want to know if I can still use these in the long run without compromising safety. I know a crack on a rim is stating the obvious and if I'm skeptical, it would be smart to just buy a new rim, but I'm in need of a well functioning bike as the pandemic restricts public transportation, and buying a new rim just doesn't fit my budget right now.
If I can repair these, how would I proceed? These rims are too beautiful to let go, and it would be nice if I can do something about it.
I shined a flashlight through the crack and it seems that light does not seep through it, if ever that helps. I will inspect it further to see if the crack I saw from the inside is just from the paint and not the aluminium. By any chance, if it is just a deep surface scratch, will the rim still be usable for a long time or so? If it helps, I won't be using v/u brakes.
Picture of the supposed crack in the inner part of the side wall: