I just bought myself an old vintage Koga Miyata and just realized today that there's a weird dent on the frame near bottom bracket.
Is this something I should be worried about? Or is it normal with these kind of frames, and what's it for?
EDIT judging from other pics of the same frameset it seems like it's normal? https://www.velosaloon.com/products/koga-miyata-gents-touring-frame-in-58-5-cm-c-t-57-cm-c-c-with-high-tensile-1024-tubing
Any idea what they are for and why aren't they symmetrical?