GP Bikes supports 4 types of front suspension geometry.
1) "Telescopic". Used on almost all racing bikes.
2) "Push Arm". The front wheel is attached to an arm, with the pivot behind.
Example: speedway bike.
3) "Trail Arm". Same as push arm, but the pivot is in front of the wheel.
Example: Vespa.
4) "Rigid". There is no suspension and the front wheel is connected directly to the steer.
Probably only used on minibikes.
Thanks for this!