Alignment question, Amount of toe after Turbo tie rod installation Options

[Bartlett 914]

I installed the turbo tie rods today. I made up a temporary string setup and here is what I measured. My measurements were made at the rim not the tire.
Drivers front. .062 toe in
Passenger front .070 toe in

Drivers rear .033 toe out
Passenger rear .062 toe in

I made no adjustments on the rear. I intend to make a better string setup. I will tackle the rear then. I am just unsure about where I should be measuring. If I am to have 1/8 total toe in the front and this is to be measured at the outer diameter of the tire, then I have too much toe. It seems there are so many different measurement methods, I get confused. Measure at the rim. measure outer diameter of the tire and of course degrees. I have been having problems with my car eating tires. The fronts would scallop. I had is aligned at a tire shop last year and it was better but not fixed as I am trashing some tires after 10K. These are on the rear now and good tires are on the front.

[Bartlett 914]

Well here is the answer to my own question.

Alignment is measured in degrees so maybe it is best to keep it there. The manual calls for 20' Toe in. The amount is up to you. Some want zero toe and maybe racing wants some toe out. there are 60 minutes in a degree so 20 minutes is .333 degrees. You take the sin of .333 degrees and multiply this by the distance you want to measure.

My rim is 16".

20' = .333 degrees
sin .333 degrees = .058
16" X .058 = .093"

In my case the front of the rim would measure .093 more than the rear of the rim.

If you were to use the outer tire diameter or the edge of some panel (as in the Pelican write up) you would enter the different width.

For different angles (minutes) remember that 1 minute is .01666 degrees. Just multiply this my the number of minutes desired and find the sin for that angle and multiply that with your measuring width.