Originally Posted by
topflightpro
Rpen is correct.
Saddle set back is a function of leg length and determining the proper place to have your saddle in relation to the Bottom Bracket. It has nothing to do with reach or balance.
Figure out where you saddle needs to be first.
Then, if you need to adjust reach, you change stem length.
As for the video of a guy on a trainer leaning forward with his hands around his back, that is only a reflection of his core strength. It has nothing to do with the quality of his fit.
On stem length, I am suspecting that may be my issue. I went from 120mm to 100mm but I see a lot of frames like the BMC roadmachine that are my size (52) shipping with 90mm stems. All I have done so far is lower my stem to slammed, which I like the feel of a lot as it helps me ride a little lower. My issue is that I still feel like there is too much weight on the bars, but it got a little better when I slammed the stem.
Shorter stem for fixing balance too forward, reach a little too far? I have a long torso, but shorter inseam of 29. Arm length is 21. So I am starting to think that may be something I should look at.