I just saw the geometry for a Poseidon Redwood and it seems...curious.
The XL bike is for people 6'3 and taller, but the stack height is 584mm and the reach is 392.2mm. What now? That is goofy. That is so absurd it doesnt even deserve to be taken seriously.
What person at 6'3, much less taller, is properly fit on a gravel bike that has a stack height of 584mm and a reach of 392.2?
A Trek Checkpoint in the largest size has 639mm of stack and 417mm of reach.
That Poseidon's stack height and reach is right between a size 54 and 56 for the Checkpoint, and Trek suggests someone about 5'9 would be between those sizes