31.8 mm would more than likely be the seat tube, not the seat post. As hippy said the most common size is 27.2 mm
31.8 mm would more than likely be the seat tube, not the seat post.
As hippy said the most common size is 27.2 mm
a few of aluminium MTB frame makers like klein, used to use 31.6mm seatposts
@31trum started
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a few of aluminium MTB frame makers like klein, used to use 31.6mm seatposts