Originally Posted by
jideta
That 20mm on the stem is a lot.
Just think what 20mm setback on seat post means.
I used to think cyclists were crazy; but fit is literally a game of millimeters.
Moving your seat changes the geometry of your hip, knee and ankles, which are all under load and constantly moving while cycling.
Moving where your hands rest isn't anywhere near as significant. If it were, the drops wouldn't be there and we couldn't drop our stack and shorten our reach mid ride (by switching to the drops) or shorten our reach (by holding the tops) without consequence.
Where your butt is affects your performance and wear and tear on your joints.
Where your hands are... not so much.