Pivot Cups hug the pivot pin on the hanger, keeping it nice and snug. A good pivot cup can turn a sloppy truck into a brand new truck with zero slop and consistent lean.
Truck pivots are finally receiving the attention that they deserve in the skateboarding world. Their effect and contribution to the overall feel and control cannot be overstated so let’s take a look at what they do and why they are important.
For the sake of this article, let’s establish two categories of pivots, two categories of trucks and two types of pivots: Trucks can be categorized into two broad classifications, reverse king pin (RKP) such as Aera, Caliber, PNL Strummers, Buzzed Beefcake, Paris and traditional king pin (TKP) such as Independent, Theeves, Gullwing Chargers, Ace and Krux.
RKP trucks exhibit a fairly straight-forward action when they turn, the imaginary line drawn from the nose of the hanger pivot through both the base plate and the center of the diameter of the king pin provides the axis of rotation for the hanger.
TKP trucks on the other hand exhibit a much more complex movement that is very dependent on the truck’s design geometry. It is characterized by both rotation and angulation at the pivot point. Pivots can also be categorized into two types, a cup and a tube.
The cup is simply a closed-ended style where as a tube is open-ended. Since they are both acting as a pivot, the material used should be lubricated, which is why we use our self-lubricating WFB compound.
Pivots in Action: Depending on a truck’s design, pivots can be used to accomplish several things. They are used for the obvious – to provide a pivot point for turning – and they can also provide an end point and act as a “thrust” bearing, keeping the king pin centered in the hanger. Without an end point, all the responsibility for positioning the king pin in the center of the bushing seat now falls on the bushings, so the lack of a pivot end point front loads the bushings to support the hanger position.
With a well-defined bushing seat, this is usually not a problem, but in ill-defined or nonexistent seats, if the pivot tube or cup is not also acting as thrust bearing, the area behind the pivot can crash into the base plate damaging both the hanger and the baseplate. This movement can also cause the bushings to come out of the seat causing a loss of control!
The thrust aspect is much more obvious in TKP trucks due to their design geometry that more evenly splits the responsibility to carry the load between the bushings and the pivot. The durometer of the pivot defines how much feedback you receive from the trucks. The harder you go, the greater the feedback.
The softer you go, the plusher the ride, the more forgiving they are and the feedback is now minimized. We find our WFB 96a to be the perfect combination of feedback and performance.