New answers tagged creak
As a fellow tall guy, try temporarily lowering your seat by half and see if the creaking goes away. If yes, your seatpost is simply too high and unsupported, so buy a longer one. 350mm and 400mm are available now, not overly expensive. Have a good close look at the frame for cracks too - I broke a frame by having the seat too high.
Also make sure the washers are set correctly.
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