One of the things that Tony Foale wrote about is that with a FFE (funny front end) with steep rake (around 13-16 degrees) you don't need any offset between the steering axis and the wheel axle to have sufficient trail. That lack of offset means that the side wind blast against the wheel is balanced to either side of the steering axis. With a normal rake and fork clamps that are offset 50-75mm moving the axle in front of the steering axis the wind blast will push the wheel around the steering axis and perturb the steering.
cheers,
Michael
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