Handlebar considerations – a hint
Along with the 168 frame I ordered a 100/400mm fully integrated handlebar. I also ordered the VB-HB-021 (2021 New Carbon Handlebar with Separate Stem) with a 110mm stem and a 400mm bar. With the VB-HB-021 option I intended to have a longer cockpit compared to the fully integrated one. However, it turned out that the VB-HB-021 option is shorter than the fully integrated one, although number wise the stem is longer.
Handlebars and stems are always very tricky. What you have seen could have been seen beforehand (if you know what to look for and know about the hurdles there.)
Lets assume the integrated one also has a bar and stem part to explain your problem.
The integrated bar has a given reach of 80mm vs the 75mm of the separated bar. So with identical stems the integrated one would be 5mm longer - this would lessen the difference to 5mm with identical 100mm or 110mm stems.
BUT the stem angles are different - the integrated one levels out, while the separated one still has some upward angle.
This is very hard to decipher from the website - I tried to illustrate this below.
1 is the separated one - see the angle? Also visible in the placement of the measure of 90/100 etc.
2 is the integrated one - no angle at the connection point.
So if you are just looking for the "reach" of the stem the 100mm integrated one is probably more like 95mm and the separate is angled so much upward that 110mm might be less than 100mm - combine this with 5mm less reach in the bar and your observation makes sense.
You can play around with the Stem Comparison tool to figure things like this out in more detail:
http://yojimg.net/bike/web_tools/stem.phpBTW: Full disclosure - I would have made the identical mistake and as I went with the integrated bar and had to guess the real reach with no real angle given it came out a bit different than I planned... paired with the long SRAM Hoods my fit is a little off, so more spacers than planned have to stay for the moment.