toe-in, just to be sure..
 

When specs state to have a toe-in of say 1/32", do they mean the difference between A and B (which is what I always used) or A and C?

A to C

:iagree:

Yes. Think of all 4 tires on two parallel planes....deviation from those planes will result in a change in toe angle. So zero toe would be all 4 tires parallel. Toe in would be as pictured. Toe out, the opposite.

It's the difference between A and B. If B was 48" and A was 47 1/2", you'd have a half inch of positive toe on the front wheels. That's total toe, not necessarily the same on each wheel.

Mike M is 100% correct.....'B' is a never-changing measurement...as the axle or hub, it is the center point of the wheel, which is the plane that pivots. . When doing an alignment check and performing a 'steering axis inclination test' (or kingpin axis inclination test as it was called in the '50's), if 'B' is different side to side, it is an indication of a bent steering arm, etc.

Mike
I respectfully disagree; it is the difference between A & C; in my simple little world, total toe is the # you want

Bill

:iagree:
B is fixed, the TOTAL toe is the difference between A and C.

No, it's the difference between B and C. I typed the wrong letter in.

A has nothing to do with the total toe.

one of us is confused, I think it's you

:cheers:

Bill

Mike is right. The measurement of B never changes. Because toe-in and toe-out is measured at the front of the tire, not the rear.

https://www.corvetteforum.com/forums...ling-arms.html


I asked about ten years ago
Check post 7
:cheers:

Isn’t the spec of 1/32 for each side? They are adjusted and set separately.

So wouldn’t the correct measurement in the way the OP asked the question be “none of the above”?

I think it would be (B - C)/2

C is toe in at the front of the tire, A is at the back of the tire and irrelevant.

I agree. The "B" dimension NEVER changes, and is equal to two parallel lines drawn through the centerlines of the hubs. Toe OUT is the measure in inches from this centerline to the current centerline of the front of the front wheel (either more or less equals either positive or negative toe).
In the "OLD" days, this led to some interesting conversations with the alignment tech who was aligning both front and rear wheels on my C2 race car, because I had to back the car onto the alignment machine in order to measure rear toe. This meant (rear facing) that the rear toe (IN) was measured as "toe OUT" at the rear of each rear wheel. :D

Depends on the number you're looking. If you want total toe, it's the difference between a and C

https://cimg2.ibsrv.net/gimg/www.cor...441f31a3b4.jpg

that would not matter, except for the sign, the difference between A-B and B-C is the same, as long as you have round wheels and the spindle is in the middle :thumbs:

:D You had me scared there for a minute, Mike.

B & C.. is correct.

So - to clarify - is that 1/32 toe per side, or total toe?

I thought it was per side?

I think there are two realities here. If you are working on a proper alignment rack then it's B & C and it will tell you toe in/out in fractions of inch or degrees. If you are a do-it-yourselfer in your home garage with a tram gage - then it's A & C because that's what the gage measures. A tram gage is limited in what it can do and not as accurate. And a tram gage will only determines total toe in/out and not individual wheel toe in/out.

Both, sort of. You set toe on each side as evenly as you can for a total toe reading. That way, the steering wheel stays centered. :thumbs: