Cast Polyurethane Freestyle Skateboard Bushings

Overview

Freestyle skateboarding requires very exact equipment and the choices for truck setup can be particularly exacting. The current favourite off-the-shelf setup is to use Khiro Purple barrel bushings with a conical top and a suitably wide hanger-side washer to prevent "splurge". This setup can be expensive and not so easy to obtain. As part of my ongoing investigations into DIY skateboard equipment and equipment modifications I have developed a prototype truck bushing of the classic stepped Tracker Stimulator shape (design available more recently as Venom Eliminators or Bear Jimz Stepped).

Polyurethane

Two part casting polyurethane is easy to get hold of in small quantities (at a premium price!) but not so easy to find with such exact properties. My thoughts are that if I find a suitable formula then I can buy in bulk to reduce costs.

First Casting Test

Using a two part 72(+/-2) Shore D mix of casting polyurethane in a PVC pipe and laser-cut MDF mould.

The finished slug was then mounted on the lathe and a pair of test bushings was cut to size to fit a pair of Independent 109 freestyle trucks.

The bushings are super stable upon initial tests.

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  mounted on lathe with live centre

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  parting tool used to face and surface