Originally Posted by mander
Not necessarily. Just think of a shopping cart wheel. It has negative rake and is very stable as a result. A shopping cart wheel that is turned around to effectively have "positive rake" will be very unstable in that state, i.e. it will tend to want to stop rolling straight and swing back around. Now consider a bike with a 90 degree head tube. What will be more stable, a negative rake or positive raked fork?
More positive rake=less trail=less stability/ more twitch.
There could be something I'm missing here and I will be grateful if someone points it out.
But if you think of it in terms of automotive front end alignment i'ts quite different. Positive caster angle IE: tilted forward at the bottom (like a fork that has more rake) makes for a car that is very stable and tends to roll in a straight line while negative caster (opposite) makes for a very twitchy and evil handling car that wanders all over the road.
The shopping cart wheel when turned forward has nothing to keep it in that position so will obviously turn right around but it is twitchy (notice how the wheels are always flitting about when you run with shoping cart?)