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I did something stupid; I replaced the cartridge bearings of a bottom bracket and they started grinding / blew up after 25 miles. Had no idea you're supposed to press them in with a tool, I removed the old ones with a blunt blade and tapped in the fresh bearings with a mallet.
Thinking of buying a bearing press tool, this bottom bracket is lightweight and I don't want to give up on it and go back to heavy 300g BBs.