Quote:
Originally Posted by prototoast
I think he's confounding a few things. "Reach" isn't affected by STA, but for a given reach, the saddle can end up in a lot of different places, changing the weight balance. Also, across different STA, you can end up with the saddle in the same place through different post/saddle setbacks. This should not affect weight distribution, everything else equal.
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When the same word can mean two different things, it is bound to cause confusion. Some people use the word "reach" to mean the distance from saddle to handlebars (i.e., how far the cyclist has to reach their torso and arms to put their hands on the bars). But in the context of frame Reach & Stack, "Reach" refers to the horizontal distance from the center of the BB to the center of the top of the head tube.
In the first definition, the STA can affect the reach, but in the second definition STA does not affect the Reach. The first definition may better reflect the end result of the bicycle fit adjustments, but the second definition is the simplest for describing the actual frame size.