Originally Posted by
Duane Behrens
A blanket statement like "You can't use saddle position to set reach" is not only inappropriate - it's incorrect.
The statement is accurate as far as it goes. You do a fit in sequence. The saddle is set relative the the cranks, then the
handlebar stem is used to set the reach. There's no reason not to use the saddle to fine tune reach a bit, but the general statement, that the saddle isn't used to set reach is still true.
Moving the saddle to improve reach might be fine if the saddle is too far forward or back to start with, but the saddle position priority remains the cranks.