Originally Posted by sosidge

Don't hesitate over the aluminium knuckles. They are plenty strong enough, and there is enough flex in the rest of the car to stop them bending.

I ran my car with plastic knuckles for a few years and didn't have a single issue. Then I started racing at a new track with different markers and I could barely finish a race without a knuckle splitting at the kingpin (oddly enough I would only lose a couple of tenths per lap!). Since changing to tamiya alloy I haven't damaged a thing.