Originally Posted by
fuji86
How can the fork have rake when it has no trail ? It's a straight fork ?
*slams head on desk*
Rake is how far forward the axle is from the steering axis. Trail is how far behind the tire's contact patch is from the steering axis. Trail decreases as rake increases.
Less trail is what makes a bike steer "twitchy" (which is why track bikes typically have shorter rakes, for greater trail, for more stability, to compensate for steep headtube angles).
It doesn't matter what the actual form of the fork is, it could be curved or "straight blade" and still have the axle in the same place ("rake").
edit: Wrote "more" instead of "less" when describing trail.