Please note that the stem is effectively angled upward, which raises the handlebar position by ~20mm for a 120mm length stem (~17 for 100). I believe you'll be pretty close, perhaps 5 to 8mm lower than what your performance fit asks for.

Yes you are right, i re-did calculation later and realized it was a matter of some millimeters, depending on the stem 'stack'.

Anyway even though it's not shipped yet, it's ordered and I think that it should be ok.
At least there will be no excuse that my frame is to upper   I'll be the only to blame .  I don't think I'll be the guy who does a lot of really long rides so should be good, i'll get used to it anyway.
I emailed them to change stem for a 110, hoping it won't mess the order

I am thinking the opposite, actually: a lower position requires a longer stem compared to a more upright one. Imagine yourself sitting on the bike completely upright with a vertical back, then visualize how far your hands would be able to reach. Contrast that with sitting on the bike with a completely horizontal back, you'd be able to reach much further and accordingly would need a longer stem. But if you are feeling really stretched in the performance fit, going with a shorter stem would make sense.

Yes, I understand what you mean, you are right.
But I am thinking that this is to have the same "relative" reach, like your arm will be as far of your body with the longest stem on a lower position than on a higher stack with less reach.
Reach position will feel the same but in this case, you are more horizontal, with a more agressive position. That's why I thought, if your stack is lower, but you don't want to be more horizontal, like you want your torso to have the same angle to keep same, you need to also reduce the reach ?

Anyway thank you for all your replies, I appreciated very much.
I apologize for my english which is not the best, hoping I was not too painful to read

I downloaded a CAD open source software at work to try to do the same as you, but couldn't even figure out how to draw a line with length and angle  I gave up haha

another thing is don't forget to account for the reach of the handlebars and shifters themselves, some could be 10-20mm longer/shorter than another

yep sure, I was saying that on the bike fit report it was not written,  but I just realised there the length from saddle to hood, and saddle to the end of stem.
So I could calculate it uses 135mm for bar+lever reach. This is about what i measured with tiagra lever and 80mm reach handlebar. 

Hi everyone! 

I'm a bit new to cycling, currently riding a cheap triban bike, pretty heavy, weighed at 11.45kg, I'd like to buy a new frame to build a better bike
I'm not riding a lot yet, I'm running 8 times/week, but I start adding some cycling in my training plan with my coach.

I might increase the volume during the season, and why not try to do some races during the summer !
There is not much running races during summer so I think doing more cycling from april to summer could be something i'd keep above years.

Anyway, I did a static bike fit cause I was scared to not choose the right frame size  ,  as I'm always in between sizes when looking at rider height.
I'm about 177cm, so 5'10" for 68kg.

The bike shop gave me two report, with geometry for a comfort position and one or a competition position. I'm adding the pics.



I think i'll more look into the competition position, as my bike has been fitted according to this and I still feel pretty comfortable on the short rides I did (didn't ad the 20mm on stem yet).

What makes me doubt now, is that I see most people saying to go the lower size when you are in between.
However if I look at the stack, it's always way lower than I have on the report. Even when looking at the upper size, it's still lower and looks like I'll need spacers, but in this case i'm afraid not to have margin to lower the stack.

Do you think that the bike fit is reliable? it was shimano bike ft dynamic lab, smth like this (https://bikefitting.com/fr)
Or maybe that the position they gave me is not that agressive and I could go with lower stack ? Reach on most of these agressive frames are lower than on my report though

I was for example looking at speeder r55, winspace t1150-gen2 M (381 reach, 535 stack), or L (388 R, 560.5 S). Yoeleo r12 for 900€  looks like a really good option to me, as their sizing is in between with 54 frame (386 R, 550 S).
I Might go for this one, it's almost exactly in-between reach and stack of tarmac sl8, their calculator gives me either 54 or 56cmby  changing only 1cm.

Now there are some thing I'm not sure, for example, what stem length should I choose ? On the bike fit report I don't understand which reach of the handlebar is used. It looks like 80mm is standard but idk.
Also if the saddle has offset I should add this offset to the reach to calculate stem length ? A bit the same problem with less steep seat tube angle.

What I like on yoeleo is that we can choose between integrated handlebar and separated stem and bar. Integrated looks clean but I think that separate would be a more wise choice. As a beginner, i could easily try different fit, and maintenance would be easier, especially if I let cables outside. What do you think ?
a stem is only 20€ at decathlon, about the same weight as the carbon one though, so wondering why pay for a carbon.

But the handlebar coming separated is only 64mm reach, so i guess i should add 10mm to stem ? The longest is 120mm though...  .  As for angle,  it's 10°, a bit more than 7° on the one-piece, so it highers the stack ?

I'm trying to understand how geometry works 

I think I'll try to take a photo of myself on my bike with current position to see if I'm low. Because I'm in ideal stack according to the fit, but I don't feel like I am very low. Even if I lack 2cm on stem.
We could easily put me in the right position while my bike which is a triban rc500 M with endurance geometry, kinda weird.. 

Anyway, I'd appreciate any advice or suggestion about sizing or even frames
I already ordered the farsports wheelset