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# castor

### Tech Articles

Discussion and questions related to the course Motorsport Wheel Alignment Fundamentals

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?

Cheers

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:

https://itstillruns.com/calculate-caster-angle-7551573.html

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"....

Measuring caster at different angle due to restriction

when measuring caster on a race car , due to larger tires or lower ride height we may not get to 20 deg in/out to directly read the caster off of the gauge, what is formula/ratio to calculate the caster at 10 or 15 deg in/out , please let me know, kind regards Behr

See David's second post...

Don't forget to lock the brakes up to prevent the wheels rotating.

We usually reply within 12hrs (often sooner)

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