How to calculate toe in degrees?

"AntiSpeed" (AntiSpeed) 10/08/2018 at 15:04 • Filed to: None

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My google skills are failing me and my math skills have been failing me since 1st grade so I need some help. Does anyone know the formula to convert toe from measurements (the front/rear of a 13" rim to a string parallel to the centerline of the car) into degrees? As far as I understand it should be some simple trigo nometry but I can’t find anything about it.

Thanks! Classic IndyCars for your time!

OPPOsaurus WRX > AntiSpeed 10/08/2018 at 15:12

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i just put the lines into CAD and use the measure degree tool and let it do the math for me

Echo51 > AntiSpeed 10/08/2018 at 15:17

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https://www.instructables.com/id/DIY-Precise-Alignment-Toe-in/

step 4 has it

AntiSpeed > Echo51 10/08/2018 at 15:30

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That’s very helpful, thanks! 

Michael > AntiSpeed 10/08/2018 at 15:31

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inverse tangent of the toe in (in inches) divided by the wheel rim (in inches) to degrees
tan-1(.25/13)=1.1 degrees toe in per side. Watch out for radians

In google:

“ inverse tangent (.25/13) to degrees”

AntiSpeed > Michael 10/08/2018 at 15:43

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Thanks! How would one input that in a calculator that has sin/cos/tan buttons?

Michael > AntiSpeed 10/08/2018 at 15:50

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picture of said calculator?

usually there’ll be a “2nd” function, and behind tan will be tan-1.

Or, literally, type it into google and the answer pops up

tromoly > AntiSpeed 10/08/2018 at 15:52

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(arctan (.25/13))*(180/pi), something like that. Depending on the calculator might use tan^-1 instead.

AntiSpeed > Michael 10/08/2018 at 16:02

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I was mainly thinking of the iPhone calculator. Would it be tanh or is that something else?

Michael > AntiSpeed 10/08/2018 at 16:08

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Tanh is different. See what happens when you hit 2nd

AntiSpeed > Michael 10/08/2018 at 16:21

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Oh! It switches to tan-^1