I created a topic on the sales sub-forum but if you have not read it, I sell my LCR018-D in size 54 like brand new because of a wrong size (with HBR17 360*110 mm and two seaposts). PM if you want.
BeR, may I ask which direction it's wrong size - too small or too large?
Having read whole thread couple times and about to order, I noticed you are similar size to me (181cm, 86cm inseam). Narrowing to size 54, and would be nice to hear your comments on sizing. Also noticed your sales post, but I am too eager for glossy finish

Regarding slammed setup and which covers / spaces needs to be there to know actual stack of setup is bit unclear. How to read this:
"There should be no reason why the bar can’t sit directly on top of the bearing cap. It’s the only mandatory interface needed.
Compression ring. 8.3mm
Cover. 10mm
Thick spacer. 10mm
Thin spacer 5mm"
For the sizing I hear comments about getting proper bike fit. However, I was not able to find decent fitter in my region. Also think it's part of the build and hobby to experiment. Seeing multiple size discussions in this thread, maybe someone can say if my thinking is completely false.
Current bike is Kona Rove ST 2018, size 54. A relaxed gavel bike. I have played with multiple stems and swapped to more narrow handle bar. I am trying to replicate reach and stack of the setup. With my testing I have figured out that I don't want any longer bike. Frame reach is 388mm and stem 90mm. LCR018 size 54 I could then choose 90mm or 100mm stem to match this.
This will be my first road bike, so I have no experience of how low I should go with stack. I tested my current setup removing all spacers and invertin stem to negative -6 degrees. Feels fine and I could go lower. Kona frame stack is 590mm vs, LR 54 569mm, difference of 21mm. With 8mm rise on handle bar this results 13mm. But are there other components I need to add? Tryin to figure how low I can go.