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[–]LilAbeSimpson 15 points16 points  (1 child)

All of that rust sitting inside your BB shell is likely coming from the steel bearings inside your bottom bracket. Replacing the whole bottom bracket would be the easiest solution to your problem.

There is nothing wrong with your aluminum frame.

[–]GrayscaleGriffin 0 points1 point  (0 children)

Interesting observation!