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Old 03-25-2014, 02:09 PM   #1
Red 2010 Camaro
 
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Need Help With Camber Measurement

Would some one who has had their REAR WHEELS aligned with a MINUS ONE DEGREE OF NEGATIVE CAMBER or close, PLEASE take the edge of a 24 in level, holding it against the LOWER BOTTOM RIM LIP, and measure the distance from the TOP RIM LIP to the edge of the level.

What I am trying to determine, is how much the wheels are ACTUALLY TILTED in at the top of the wheels with approx. ONE degree of negative camber. I am using a 19 BY 10 in. wheel in back , and a 18 BY 8.5 in wheel in the front using custom built FORGED conversion wheel adapters.

After lowering my Camaro a full TWO inches using Pfadt Feather Light Coil- Overs, my wheels are tilted in 5/8 of an inch, which I think is about THREE degrees of negative camber.

I am just trying to get some base line dimensions< from some one who has had their camber set at MINUS ONE DEGREE or close. I have attached a few pics for reference.

Thank You In Advance for your help,

Red 2010 Camaro
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Old 03-25-2014, 03:22 PM   #2
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Why not use math? Stock tires on a Camaro SS are 28.7" in diameter, or 14.35" in radius. The tangent of a 1* angle is 0.017455. Multiply the tangent times the radius and you get 0.2505 for the length of the alpha leg of the triangle. Therefore, the horizontal difference from top to bottom of the centerline of the tire/wheel is 0.501", which means the bottom of the tire is 1/2" farther away from the differential than the top of the tire. If you have different diameter tires you can substitute their radius. Tangent of a 2* angle is approximately (not exact, but close enough to the 5th decimal point) twice that of 1* angle, and so on.
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Old 03-25-2014, 05:20 PM   #3
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Why not use math? Stock tires on a Camaro SS are 28.7" in diameter, or 14.35" in radius. The tangent of a 1* angle is 0.017455. Multiply the tangent times the radius and you get 0.2505 for the length of the alpha leg of the triangle. Therefore, the horizontal difference from top to bottom of the centerline of the tire/wheel is 0.501", which means the bottom of the tire is 1/2" farther away from the differential than the top of the tire. If you have different diameter tires you can substitute their radius. Tangent of a 2* angle is approximately (not exact, but close enough to the 5th decimal point) twice that of 1* angle, and so on.
You are clearly a mathmatical WIZARD. The 265/35/19 in.REAR tires that I am using, measure 26.3 in. in diameter. I understood about 10% of what you said.

Would some one PLEASE just measure what I asked for?

Thank You

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Old 03-25-2014, 05:28 PM   #4
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use a app on your phone, they have digital readings, put it flush to your level, but you need to be on a flat surface
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Old 03-25-2014, 05:36 PM   #5
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use a app on your phone, they have digital readings, put it flush to your level, but you need to be on a flat surface
Thank You SO Much. That inrormation I can understand!

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Old 03-25-2014, 05:49 PM   #6
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You are clearly a mathmatical WIZARD. The 265/35/19 in.REAR tires that I am using, measure 26.3 in. in diameter. I understood about 10% of what you said.

Would some one PLEASE just measure what I asked for?

Thank You

Red 2010 Camaro
Just divide 26.3 by 28.7 times .501 and you'll get your answer. If you can understand one of those fancy phones (which I can't), just use its calculator. The answer is 0.459". Nothing Wizardly about it, basic trig. 3* negative camber would be 3 times that, or 1.37". Assuming your 19" wheel has a 1/2" lip, measuring at the lip you should see 0.349" difference from bottom lip to top lip for each degree of negative camber.
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Old 03-25-2014, 06:02 PM   #7
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Just divide 26.3 by 28.7 times .501 and you'll get your answer. If you can understand one of those fancy phones (which I can't), just use its calculator. The answer is 0.459". Nothing Wizardly about it, basic trig. 3* negative camber would be 3 times that, or 1.37". Assuming your 19" wheel has a 1/2" lip, measuring at the lip you should see 0.349" difference from bottom lip to top lip for each degree of negative camber.
Thank You for the helpfull information regarding the basic trig. I have been out of school for to many years to remember trig. functions.

Thanks Again For Your Help.

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Old 03-25-2014, 06:07 PM   #8
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Just divide 26.3 by 28.7 times .501 and you'll get your answer. If you can understand one of those fancy phones (which I can't), just use its calculator. The answer is 0.459". Nothing Wizardly about it, basic trig. 3* negative camber would be 3 times that, or 1.37". Assuming your 19" wheel has a 1/2" lip, measuring at the lip you should see 0.349" difference from bottom lip to top lip for each degree of negative camber.
The 2008 C-6 Corvette OEM wheels that I am using do NOT have a lip at all. Would it still be 0.349 for each degree of negative camber?

Thanks

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Old 03-25-2014, 06:34 PM   #9
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The 2008 C-6 Corvette OEM wheels that I am using do NOT have a lip at all. Would it still be 0.349 for each degree of negative camber?

Thanks

Red 2010 Camaro
Red, I would venture a guess that I have been out of school longer than you, I'm 69 years old. I'm too old to understand these fancy phones. If you will give me the diameter of wheel where you want to measure it, I can tell you what the difference in measurement should be for each degree of negative camber. It will probably be very close to the .349" if it is a 19" wheel.
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Old 03-25-2014, 07:58 PM   #10
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Red, I would venture a guess that I have been out of school longer than you, I'm 69 years old. I'm too old to understand these fancy phones. If you will give me the diameter of wheel where you want to measure it, I can tell you what the difference in measurement should be for each degree of negative camber. It will probably be very close to the .349" if it is a 19" wheel.
I will check the EXACT diameter of the 19 in. wheel and get back to you in the morning. Thanks SO much for ALL your help full information thus far. You are correct, I am 62 years young!

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Old 03-25-2014, 08:48 PM   #11
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I will check the EXACT diameter of the 19 in. wheel and get back to you in the morning. Thanks SO much for ALL your help full information thus far. You are correct, I am 62 years young!

Red 2010 Camaro
every 26.3" tire I have actually measure 26" new and mounted.
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Old 03-26-2014, 09:47 AM   #12
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Red, I would venture a guess that I have been out of school longer than you, I'm 69 years old. I'm too old to understand these fancy phones. If you will give me the diameter of wheel where you want to measure it, I can tell you what the difference in measurement should be for each degree of negative camber. It will probably be very close to the .349" if it is a 19" wheel.
jbrown13

Went out this morning and measured a spare 19 inch wheel with no tire mounted, and the OUTSIDE WHEEL FACE diameter measures 20.500 in.

The inside WHEEL LIP DEPTH where the tire bead makes contact on the INNER WHEEL BARREL is .750 or 3/4 in. If you multiply this 3/4 in. dimension TIMES TWO which equals 1.500 in. and subtract it from 20.500 you do in fact get a WHEEL BARREL diameter of 19 in.

My FINAL QUESTION is, what would the the dimension be for EVERY ONE DEGREE or NEGATIVE CAMBER of the 19 BY 10 in. wheel after installing it on the Camaro.

I have a level cut to a 20.500 in length, and will be checking the NEGATIVE CAMBER of the wheel by using the edge of the level, contacting the wheel at the bottom, which would be the 6 O CLOCK position.

I will then measure the dimension at the top of the level at the 12 O CLOCK POSITION, from the edge of the level to the wheel face, after CENTERING the SITE GLASS BUBBLE.

I can then figure the CORRECT TOTAL CAMBER of the wheel after knowing the correct dimension for ONE DEGREE OF CAMBER.

Using the above method, the Camaro is currently at 5/8 in or .625 of NEGATIVE CAMBER after lowering a full TWO INCHES. I have been told that the factory LOWER CONTROL ARM eccentric adjusting bolt has a TOTAL adjustment of ONE DEGREE.

Thank You SO MUCH for your and every ones help thus far.

Red 2010 Camaro

Last edited by Red 2010 Camaro; 03-26-2014 at 09:51 AM. Reason: change word
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Old 03-26-2014, 11:19 AM   #13
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That thing is pretty low in the rear, wouldn't drive it around a whole lot. The front bushing on the rear upper control arm is maxed out or close to it and you can damage it.
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Old 03-26-2014, 02:44 PM   #14
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Originally Posted by Red 2010 Camaro View Post
jbrown13

Went out this morning and measured a spare 19 inch wheel with no tire mounted, and the OUTSIDE WHEEL FACE diameter measures 20.500 in.

The inside WHEEL LIP DEPTH where the tire bead makes contact on the INNER WHEEL BARREL is .750 or 3/4 in. If you multiply this 3/4 in. dimension TIMES TWO which equals 1.500 in. and subtract it from 20.500 you do in fact get a WHEEL BARREL diameter of 19 in.

My FINAL QUESTION is, what would the the dimension be for EVERY ONE DEGREE or NEGATIVE CAMBER of the 19 BY 10 in. wheel after installing it on the Camaro.

I have a level cut to a 20.500 in length, and will be checking the NEGATIVE CAMBER of the wheel by using the edge of the level, contacting the wheel at the bottom, which would be the 6 O CLOCK position.

I will then measure the dimension at the top of the level at the 12 O CLOCK POSITION, from the edge of the level to the wheel face, after CENTERING the SITE GLASS BUBBLE.

I can then figure the CORRECT TOTAL CAMBER of the wheel after knowing the correct dimension for ONE DEGREE OF CAMBER.

Using the above method, the Camaro is currently at 5/8 in or .625 of NEGATIVE CAMBER after lowering a full TWO INCHES. I have been told that the factory LOWER CONTROL ARM eccentric adjusting bolt has a TOTAL adjustment of ONE DEGREE.

Thank You SO MUCH for your and every ones help thus far.

Red 2010 Camaro
This is based off the 20.5" dimension since that is what you'll use for your measurement. Every degree of negative camber will get you .358" (roughly 23/64") between the top of your level and the wheel. Using the .625" measurement you are at approximately 1.75* negative camber. Hope that helps.

Jeff
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Old 03-26-2014, 03:02 PM   #15
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Alignment machine. Done.
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Old 03-26-2014, 05:26 PM   #16
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Alignment machine. Done.
I have a sense that he has something other than alignment in mind, maybe figuring tire clearance before purchase, etc.
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Old 03-26-2014, 07:01 PM   #17
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I have a sense that he has something other than alignment in mind, maybe figuring tire clearance before purchase, etc.
Thank You SO MUCH to ALL of you who have taken your time and helped me understand how to figure the TOTAL NEGATIVE CAMBER PER DEGREE using the 19 BY 10 in. wheel.

I hate to say this, but I will in fact probably have to raise the car a little, so I do not damage those expensive coil over shocks, or anything else regarding the suspension.

All The Best,

Dave
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Old 03-26-2014, 09:53 PM   #18
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Originally Posted by Red 2010 Camaro View Post
Thank You SO MUCH to ALL of you who have taken your time and helped me understand how to figure the TOTAL NEGATIVE CAMBER PER DEGREE using the 19 BY 10 in. wheel.

I hate to say this, but I will in fact probably have to raise the car a little, so I do not damage those expensive coil over shocks, or anything else regarding the suspension.

All The Best,

Dave
Your welcome.
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