Girder Fork

Thomas Stiewe
Lange Str. 13
21614 Buxtehude

Phone: +49 (0)175 20 20 310
E-Mail: info(a)racecraft(dot)de

Advantages and function of a girder fork with double wishbone

In a braking with the girder fork remains the geometry in comparison to the telescopic fork almost unchanged. While you

braking, the rake angle changed only minimally 1°, the trail is increased by a few millimeters and thus also the wheelbase, so

that in a direct comparison with a telescopic fork a difference in the wheelbase of some cm can emerge. The girder fork chassis

is stabilized while braking.

The steering and the behavior in curves is significantly easier. The geometric leverage of the fork press the center of gravity

(CG) back. And the tire forces are decrease in comparison to the telescopic fork, which is positive for the grip of the tire.

The place of the center of gravity and the reduced tire forces, allows a higher braking force and thus to braking later. The

chassis behaves in the load alteration in the cornering apex neutral and very homogeneous. Even the chassis stabilized in

curves with the wheelbase extension, depending on the speed and the resulting of force.

Therefore, the wheelbase of girder fork chassis can be constructed shorter as the telescopic fork chassis.


Claude Fior

The Fior wishbone fork was 1977 till 1987 similar to the Hossack front end later developed in Britain... 



John Britten

...and followed a decade later by John Britten in NZ.



See here two videos about John Britten: Video 1 | Video 2