Originally Posted by
PeteHski
I'll take your word for it about this correlation between stem length and fork offset, but I don't think it actually means very much. What does this idea of a "neutral" starting point actually mean in reality? Stem length simply affects your hand position on the bike (reach) and how relatively quick or slow the steering feels (which is also affected by many other parameters besides stem length). So a long stem will increase your reach and make the steering feel slower/less responsive. That's about it.
Yes, stem length determines how quickly or slowly a fork steers. Yet there is a 'neutral' length which is neither long or short and is realized by a stem having the same center-to-center distance as the fork's offset, or rake. Stems longer or shorter than neutral alter the needed rider input while a neutral length does not and represents the minimal input needed. In other words, using a neutral length stem allows a rider to 'feel' a front tire's traction more directly.
As for weak stems, yes definitely avoid those!
Forged metals are stronger and more durable than cast metals and are more expensive, but consider the value of your safety. 2D is traditional forging and heavier, but gets the job done. 3D is modern forging and lighter, but usually is more expensive.