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Old 07-16-20, 08:34 AM
Join Date: Jun 2010
Location: NW,Oregon Coast
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answer is C , bottom of the seat post at least in as far as the bottom of where the top tube joins the seat tube..

On my touring bike build I had a classic Campagnolo seatpost I wanted to use, since it was close to max ( because of sloping top tube)
I had a welder add a length of a common Kalloy seat post, that diameter, then get the weld bead machined down smooth..
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