BikeCAD Pro provides a means of checking for interference between the fork crown and the down tube. To access this option, select View >> Fork crown clearance or simply right click and choose Fork crown clearance from the resulting popup menu.
The above dialog box will require four dimensions. A is the distance between the fork legs. B is the distance that the fork legs lie ahead of the centerline of the steerer tube. C is the distance that the fork adjustment knobs lie below the level of the crown race. D is the diameter of the adjustment knobs.
This all assumes that the adjustment knobs are the most at risk of interfering with the down tube. Of course, this function can also be used for non-suspension forks simply by measuring the equivalent geometry on the fork crown used.
This feature does not require that the fork be dynamically rotated. BikeCAD automatically shows the fork crown in the worst case scenario. Where dimension B is 0mm, the fork crown will be turned 90° if B is greater than 0mm, the fork crown will be turned greater than 90°.
When the dialog box is displayed, the side view of the fork and the wheel are replaced with the rotated view of the fork crown. When the dialog box is closed, the conventional BikeCAD display is restored.
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