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@atanz
its pretty fun to ride and the quality and feel of the steel frame is amazing. one of the smoothest fixed gears i've ridden. I believe the seat tube measures 66cm - my saddle height is about 73cm. the seatpost is only like 10cm! a longer seatpost won't fit due to the seat tube shape becoming aero in section. the top tube is 55cm. its essentially the same type of geo as a lowpro seeing the head tube is the shortest it could possibly be - but instead of cuving the top tube, the builder left it level. one could say the rear of the bike is a bit more stiff due to the shorter seat stays and more aero due to the top tube being out of the wind. every tube on the bike is aero shaped except the TT.
also each one of these yamaguchi frames i've seen has had the seat tube cut to fit the rider. its much like the seat masts you see today on modern frames - except without the integrated saddle rail clamp.