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Motorsport Wheel Alignment Fundamentals

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What's the principle of that we steer 20 degree to measure castor?

Caster (American spelling) turns into Camber when you turn the wheel. By turning it a known amount(20 degrees), and measuring the camber, we can calculate the castor (British spelling)

Can I just on this thread a bit ( sorry )

Can caster be worked out with just a camber gauge? I know about the 20 degrees turning, but in the practical demonstration a caster gauge is always used which works it out for you.

Is there an actual calculation that can be done in order to work out the caster?


I think this equation will work:

Caster (deg) = (180 / 3.1415) * [(camber1 - camber2) / (turnangle1 - turnangle2)].

Here is another suggestion if you can zero your camber gauge:


Hi David, thanks for the reply, I have longacre camber gauge so I can zero it to carry out what is described on that website.

Where did you find that equation, looks complex!

I'm pretty sure I googled "calculate caster angle"....