I have a question regarding wheel alignment specs.
Today I did a manual check of my Healey's front wheel alignment in my garage.
The wheels/steering were pointing straight forward. My tires tread has a
center grove. Here is the procedure I used.
1.. Using a plumb-bob hung from the tire tread center grove, I marked points
on the garage floor at the front and rear centers of both front tires. The
distance between the front and rear-of-tire measurements was 25.3", my tire
diameter.
2.. I then measured the distance between the front-of-tire points (front
distance) and the rear-of-tire points (rear distance).
3.. I then subtracted the front distance from the rear distance which turned
out to be 5/16".
4.. I repeated steps 1. through 3. after rolling the car about 1/2 the tire
circumference forward to average any tire/wheel untrueness. The difference
was again 5/16".
5.. I also similarly measured distances at the front and rear points of the
wire wheel rim edges and calculated the difference, which turned out to a
toe-in of 3/16". The distance between the front and rear wheel rim edge
points was 16" (as contrast 25.3" distance for the 5/16" toe-in measurement).
So my question is: when the Workshop Manual says the toe-in should be 1/16",
what is the distance they use between the front and rear measured points?
Tire diameter? Wheel diameter? Other?
Thanks for any help.
Vrooom vrooom,
John
100-Six Erika the Red
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