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  • rear wheel camber

    if i was to decrease my rear wheel camber from 6 degrees to like 2 or 3. that would raise my rear seat height, correct?

    if so, how much?

    thanks ahead of time............

  • #2
    Yes, it would raise the RSH.

    How much depends...

    ...on your total rear wheel/tire diameter. Tell me! Then I will tell you.

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    • #3
      It would change a miniscule amount. Here's calcs I worked up awhile back for various cambers and wheel/tire sizes:




      Changing from 0 to 6 degrees camber on a 540 tire (24IN) yields a change in axle height of 0.07IN (about 1/16"). Only when you change to sports' cambers (e.g., 18 degrees) is axle-height change noticeable: about a 9/16" (~0.59") for a 24" tire.

      NOTE for scale reference: in the top picture, camber is 18 degrees.
      Last edited by chasmengr; 07-20-2012, 09:22 PM. Reason: fix typo's in diagram
      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>

      Comment


      • #4
        Originally posted by ChrissyOT View Post
        Yes, it would raise the RSH.

        How much depends...

        ...on your total rear wheel/tire diameter. Tell me! Then I will tell you.
        right now i have 16 1/2 RSH. i've got 24 x 1 3x8 wheels. 6 degree camber. i wanna go to 3 degrees.

        what is it? like a 1/2 inch every camber degree? it's a gpv, with the washers. it has 6 washers now.

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        • #5
          Originally posted by rollin64 View Post
          what is it? like a 1/2 inch every camber degree?
          Because the change in height is based on trigonometry, the change in height is not a constant rate (like 1/2"/degree).

          Originally posted by rollin64 View Post
          right now i have 16 1/2 RSH. i've got 24 x 1 3x8 wheels. 6 degree camber. i wanna go to 3 degrees.

          what is it? like a 1/2 inch every camber degree? it's a gpv, with the washers. it has 6 washers now.
          For your 24" diameter wheels, changing from 6 degrees to 3 degrees of camber would raise your RSH about 1mm (i.e., 1/25") - miniscule.

          PS: sorry I jumped in. You were asking Chrissy
          Last edited by chasmengr; 07-20-2012, 08:03 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>

          Comment


          • #6
            Originally posted by chasmengr View Post
            It would change a miniscule amount. Here's calcs I worked up awhile back for various cambers and wheel/tire sizes:

            [ATTACH]45774[/ATTACH]
            [ATTACH]45775[/ATTACH]

            Changing from 0 to 6 degrees camber on a 540 tire (24IN) yields a change in axle height of 0.07IN (about 1/16"). Only when you change to sports' cambers (e.g., 18 degrees) is axle-height change noticeable: about a 9/16" (~0.59") for a 24" tire.

            NOTE for scale reference: in the top picture, camber is 18 degrees.
            wow....thanks chasmengr. that kinda put things in perspective. it's fine you jumped in. i'm lookin for input, lol. miniscule is what i wanted to hear, haha.

            Comment


            • #7
              Leave it to chaz to point it out in a diagram.
              That's sarcasm, but definitely not in a bad way.
              Rollin' since '89. Complete C8

              Comment


              • #8
                Originally posted by Crappler View Post
                Leave it to chaz to point it out in a diagram.
                That's sarcasm, but definitely not in a bad way.
                Hey, I'm an engineer
                Diagrams are a huge part of my thinking process.
                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>

                Comment


                • #9
                  Originally posted by chasmengr View Post
                  Hey, I'm an engineer
                  LOL! Woo woo!!
                  Rollin' since '89. Complete C8

                  Comment


                  • #10
                    Don't forget to make sure your front casters are at 90o after changing. You may want to check for toe in/out on the rear wheels. If it feels more clunky after going to a 3o just move the cog up a smidge and it'll turn as fast as when it was 6o.

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                    • #11
                      You never cease to amaze me chas!

                      From your chart, do I have it right that a 25" wheel with 2 degree of camber would add 0.87" of width to the chair, versus no camber, and 4 degrees would add 1.74" of width?
                      C5-6 Complete - 8/13/1982

                      Comment


                      • #12
                        Originally posted by Brianm View Post
                        You never cease to amaze me chas!

                        From your chart, do I have it right that a 25" wheel with 2 degree of camber would add 0.87" of width to the chair, versus no camber, and 4 degrees would add 1.74" of width?
                        Thank you

                        You are reading the chart correctly. But be aware, significant-digit accuracy is misleading: real-world factors (e.g., tire & wheel characteristics) can affect these dimensions significantly. In other words, the 0.87 is about 3/4 - 1", and 1.74 is about 1-1/2 - 2" depending on a specific setup. I kept significant-digit accuracy only to reveal the miniscule change in RSH caused by camber changes.
                        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>

                        Comment


                        • #13
                          Duly noted, thanks. I have had the desire to go 4 degrees, for whatever reason(s), but in the end I don't want to add the width.
                          C5-6 Complete - 8/13/1982

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