Possibly a few errors in those geometry charts. If we take for good the value of 15 - HEIGHT MAX, then I'd say that S/M size is best for you: with an inseam of 84cm, your saddle height should be around 73cm, then a frame with 81cm maximum should be ok. Size M/L has 85cm max height, which sounds too much

Thanks. How with my inseam you know the saddle height?

Lemond formula, not always 100% perfect, but usually a good starting point

The frames are the same, the difference is in the length of the mono post and the seatpost like you said.
Do you know your pad x/y and saddle height? That's all you need
Seat posts are 40mm difference


This ST article has a nice chart for size
https://www.slowtwitch.com/...s_New_Ordu_7933.html

I have a 33" inseam with 773 saddle height and pad x/y of 470/640
With a Saddle attached and seat post at max, a S/M has 80cm of height to bottom bracket. My pad stack is at the limit on a somewhat conservative position. So you may want to opt for a M/L

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 Thanks. I don't know my X and Y. Because the articule you mentioned, i thought the neste size for me was S/M...but now....i'm confusões.

I'm trying a bike fit...but it's hard to find on my zone

I was looking for what you wrote and i have a question. You have the new Orbea Ordu (post 2021) in size S/M and you inseam is 84cm (i work better in metric), right? And what is your heigh?

Sorry for this dum question...but a friend of mine bought the new Ordu in size S/M with a inseam 82 cm and height 177cm and its about the same mesaures as mine.