Thread: Seatpost size: 27.0 or 27.2 mm
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Old 11-28-22, 09:10 AM
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Andrew R Stewart 
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Originally Posted by smd4
I’m wondering why a 1992 Bianchi seatpost would be rusty.

Were any still made of steel by that point?
A steel frame will transfer to an Al post a surface amount of rust. Unsure if that's what is the case here.
I'd rather see rust on an Al post then AlOxide Andy
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