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I reckon so to let the inevitable water out again. I am neither an engineer, bike mechanic or materials scientist but I've done it with a c.2/3 mm hole and I'm still here riding the same bikes.
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Drill it. Frame builders aren't doing any wizardry when putting drainage holes in, they're just drilling it so go ahead. It's always a good idea to have one in the BB on a steel frame
si_mon628
PhilDAS
@philphillyphilip
Big dredge on this, but do people think drilling a hole where there isn't one is a good idea? I just took the bottom bracket out from a frame I recently bought and found quite a lot of rust+ water inside. Seems structurally okay otherwise - is it worth drilling a hole?