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Old 10-29-2012, 03:27 PM
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Measuring Toe-In?

where exactly do I apply a toe-in measurement? I have a 1979 Trans Am...the manual calls for 1/8 inch =/- 1/16 inch toe in....I assume that is the difference between the center of the front of the tires vs. the centers of the rear of the tires...but a tire with a larger diameter will give a different measurement depending on how far out you go...ie a straight line from the center of the tire down vs. where the tire actually contacts the ground...where exactly is it supposed to be 1/8 inch different?

Thanks...

Mike

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Old 10-29-2012, 03:46 PM
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You do understand you have 3 basic units that make up an alignment on your car, toe. camber and caster. Toe is basically how much the front of the tire is facing inward. Most cars require toe in so that when you are driving down the road the weight of the vehicle combined with the forward motion keep the tire straight and in line with the motion. Camber and caster refer to the tilt of the tire forward and backwards within the suspension geometry and the perpendicular alignment being the top of the tire being either in or out best example I can think of to make this part easy is / versus \. Yes a larger front tire could impact the amount of toe in. Depending how much bigger the tire would determine the effect. All these measurements are required to correct for handling and correct tire wear.

Hope this helps
Ray
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Old 10-29-2012, 03:48 PM
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1/8 toe in should be from the center most outward edge of a stock sized tire.
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Old 10-29-2012, 07:26 PM
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still a bit confused on where to measure...drew a quick pic....is it the red lines or the green lines?

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Old 10-29-2012, 07:31 PM
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For toe in it should be the center black line. Your tires should be sitting slightly pigeon toed...(Toes pointing inward...toe in)..Hope it helps.
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Old 10-29-2012, 07:40 PM
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Hey Mike, here is a web-site that I hope helps, I know it can be confusing as the diagram you gave is for camber. This site should explain it.

Wheel Alignment Explained - What is Caster, Camber, Toe In, Toe Out, Alignment - Four Wheel Alignment

Ray
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Old 10-29-2012, 07:49 PM
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I should have clarified that was a top view, not a front view, with the top of the picture representing the front of the vehicle (showing an exaggerated toe-in condition).....
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Old 10-29-2012, 07:56 PM
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Then I would say the red lines, with the top of the picture being the front of the car...Still, check out the site I gave you, it's got some good information...sorry I was looking at it as a front view.
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Old 10-29-2012, 08:11 PM
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A good trick I learned was to jack the front up so both tires can spin freely. Place a cinder block or chair or something solid in front of the tire, this acts as a stable rest so you can hold chalk against the tire without wiggling around. Spin the tire and if you hold the chalk dead still, it will draw a perfect line. Do this to both tires and take your front and back measurements (the red lines) Adjust the turnbuckle until desired toe in is achieved, I run mine 0 with no toe at all, mud tires wear down fast enough as is.
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Old 10-29-2012, 08:16 PM
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Thanks guys...

I figured it was the red lines...that's how I remember it being done...

the problem I'm trying to figure out is that every tire "size" is going to be a bit different from stock or original...so 1/8 of an inch is going to make a big difference in actual tire angle based on where you measure it, since I have larger than stock tires on the front...
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Old 10-29-2012, 10:54 PM
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True, the actual angle would change as tire diameter changes. I think it is going to be close enough though. If you do the chalk circles, find 0, then add a little extra toe, should be fine. As with everything, every one is individual, just put it where it feels best.
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Old 10-30-2012, 09:48 AM
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I pick a certain groove in the tread, measure the rear of the tires from left groove to right groove as close to the axle centerline as possible, then move to the front of the tire and measure the same grooves. I can do this alone with a tape measure. The only snag I've ever had was when one the tires had a belt let go which caused the grooves to go eccentric. That was a head scratcher for awhile!

Russ
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Old 10-31-2012, 11:34 AM
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thanks for the help everybody!
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Old 12-31-2013, 01:54 PM
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note: it helps if you have turn plates.
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