Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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The type of corrosive welding you're worried about takes a bit of time, and is also greatly affected by weather and whether the BB shell has a weep hole to allow water to drain, or acts as a sump accumulating water and causing it to migrate into the threads.
Most BB shell thread corrosion occurs from the inside out, so if there's a weep hole you can go a decent interval before worrying about seizing. Even with anti-seize, mixed metal assemblies should be disassembled at least once every year or two.
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