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Thread: Measuring Camber

  1. #1
    Senior Member brian's Avatar
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    Measuring Camber

    Is there an easy way to measure camber? I'm in an old GPV Comp where I can adjust the camber by inserting washers behind the axle plate.

    If I measure the inside distance between the top of the wheels and the bottom, combined with the height at the top to get a sort of trapezoid, is there an easy formula for that? Or should I take a picture from behind and measure it in photoshop?

  2. #2
    Measure the distances, and use trigonometry to calculate camber.
    Attachment 44561

    c = arctan B'/(D/2)
    for small cambers (~6 degrees and less), c = ~arctan B/(D/2)

    for larger cambers (e.g., sports), the difference between B and B' introduces a significant error, but B' is hard to measure (or more trig formulas are required for accuracy).

    example:
    given wheel diameter (D) = 24" and B = 3/4"
    camber = arctan 2*0.75/24 = ~ 3.5 degrees

    (note "~" means about)
    Last edited by chasmengr; 04-17-2012 at 01:08 PM.
    Chas
    TiLite TR3
    Dual-Axle TR3 with RioMobility DragonFly
    I am a person with mild/moderate hexaparesis (impaired movement in 4 limbs, head, & torso) caused by RRMS w/TM C7&T7 incomplete.

    "I know you think you understand what you thought I said, but what I don't think you realize is that what you heard is not what I meant."
    <
    UNKNOWN AUTHOR>

  3. #3
    Or for $10 you can buy an inclinometer at the hardware stop.

  4. #4
    Senior Member brian's Avatar
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    1. I had to take Algebra twice so trig to me is like watching Shakespeare in Klingon.
    2. I'm a cheap bastard.

    Thanks for the suggestions, though. I'll see what I can get to this weekend.








    PS: how do I measure wheel radius while compensating for the flange created by the hub? Maybe I can find an ETRO measurement chart somewhere....

  5. #5
    Quote Originally Posted by brian View Post
    . . . like watching Shakespeare in Klingon.
    lol - fabulous visualization My wife chuckled, too ! (She is a fan of both Shakespeare and StarTrek.)


    Quote Originally Posted by brian View Post
    PS: how do I measure wheel radius while compensating for the flange created by the hub? Maybe I can find an ETRO measurement chart somewhere....
    I don't think the error introduced by the flange will be significant. measure from the center of the axle to the edge of the tire. (Have I understood you correctly?)

    try this page for more than you ever wanted to know about ETRTO tire sizes
    Last edited by chasmengr; 04-18-2012 at 01:00 AM.
    Chas
    TiLite TR3
    Dual-Axle TR3 with RioMobility DragonFly
    I am a person with mild/moderate hexaparesis (impaired movement in 4 limbs, head, & torso) caused by RRMS w/TM C7&T7 incomplete.

    "I know you think you understand what you thought I said, but what I don't think you realize is that what you heard is not what I meant."
    <
    UNKNOWN AUTHOR>

  6. #6
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    I think the washers on the gpv give 1.5 -2.0 degree camber each one

  7. #7
    Senior Member brian's Avatar
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    Quote Originally Posted by chasmengr View Post
    Have I understood you correctly?
    Yes, thanks.



    Quote Originally Posted by rolling01au View Post
    I think the washers on the gpv give 1.5 -2.0 degree camber each one
    That's a 25% margin of error, yo. That's huge if I have 5-7 washers.
    Also, believe it or not, the washers vary in thickness.

  8. #8
    If you post the distance between the top of your tires and the distance between the bottom of your tires and the diameter of your tires (24 in, 25in) I will tell you your camber.

  9. #9
    C'mon folks! We are talking about a GPV Competition which uses washers in between the axle plate and frame for camber. Applying trigonometry or attempting any other math calculation to determine the camber on a GPV is like using a tire pressure gauge to see if you really got the "100 psi" Shox solid tires the DME said they sold you.

    Take a picture with a good horizontal reference point and go from there. Paste into Microsoft Word, draw a vertical line on top of it, then change the orientation using the "format" function until the line is parallel with the wheel.

    Let's not even get into checking toe in/toe out!


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