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Castor angle on a wheelWhen viewed from the side, the king pin is tilted away from the vertical. This is to ensure that the point of pivot of the wheel, and the point of contact with the road are not the same. In other words, the wheel now has a castor or self centring effect. When drawing a castor angle, always make sure to show the direction of travel of the wheel.

Read more about castor here.

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