Originally Posted by
cyccommute
Those bottom brackets may be “old style” but I would bet that they are from modern frames that come from HelMart.
Note I'm only 21 and have done bikes for only 3 years now.
I have seen shell-sealed OEM "old style" ones on a high quality early 2000s BMX and an early 2000s Giant hard tail that suffered the same fate due to their aluminum frames, and I doubt they were lower quality cups. It seems like the cups will do this from excessive wear no matter what quality they are, the steel becoming super thin and overworked simply cannot support itself and bends down into the softer aluminum.