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  1. #1
    The Crow
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    SL-R vs HD Head Angle - All things being equal

    So all things being equal what is the HD's head angle vs SL-R? Let's say 150mm fork standard headset with HD in full 160mm mode.
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  2. #2
    Commit or eat sh!t
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    All the various HA configurations are on Ibis' website/manual

  3. #3
    The Crow
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    Not all things being equal. HD quoted with 160 or 180 fork, HD140 with 150 and SL-R with 140.
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  4. #4
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    Each 20mm in increased axle to crown height equals approximately one degree slacker head angle. You can back into each angle using this rough math. Bear in mind, different forks have different crown heights so a 36 160mm fox is not a 10mm increase over a 32mm 150mm fox, it is greater. You can find axle to crown heights for all forks searching this forum.

  5. #5
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    Iwan - 68.5 for the SL-R, 67.5 for the HD assuming a Fox 32 150 on the SL-R and Fox 36 @150 on the HD

    Geometry calc app geometryCalc

    -Shane


    Quote Originally Posted by Iwan View Post
    So all things being equal what is the HD's head angle vs SL-R? Let's say 150mm fork standard headset with HD in full 160mm mode.
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  6. #6
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    Quote Originally Posted by Iwan View Post
    Not all things being equal. HD quoted with 160 or 180 fork, HD140 with 150 and SL-R with 140.
    Last time I checked the manual had HA by 10mm increments for all their models. Page 15 of the manual. Basically, every 10mm increase is about 0.5 degree, although HD 160 was about a degree.

    It also depends on the fork you are using, as axle-to-crown measurements are different for each manufacturer. So you will have to adjust for that too.

  7. #7
    The Crow
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    Quote Originally Posted by seleniak View Post
    Iwan - 68.5 for the SL-R, 67.5 for the HD assuming a Fox 32 150 on the SL-R and Fox 36 @150 on the HD

    Geometry calc app geometryCalc

    -Shane
    Thanks. (For the answer and understanding the question! )
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  8. #8
    www.derbyrims.com
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    Quote Originally Posted by seleniak View Post
    Iwan - 68.5 for the SL-R, 67.5 for the HD assuming a Fox 32 150 on the SL-R and Fox 36 @150 on the HD

    Geometry calc app geometryCalc

    -Shane
    To further equalize, using Shane's numbers....

    Using the same fork, pick the Fox 36 @150 on both the SL-R (140) and HD160:
    68 for the SL-R, 67.5 for the HD160

    And to further equalize with the same fork, and the same rear travel, the Fox 36 @150 on both the SL-R (140) and HD140:
    68 for the SL-R, 67 for the HD140


    ..
    Last edited by derby; 12-28-2012 at 07:17 PM. Reason: typo HD160 to HD140

  9. #9
    The Crow
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    Quote Originally Posted by derby View Post
    To further equalize, using Shane's numbers....

    Using the same fork, pick the Fox 36 @150 on both the SL-R (140) and HD160:
    68 for the SL-R, 67.5 for the HD160

    And to further equalize with the same fork, and the same rear travel, the Fox 36 @150 on both the SL-R (140) and HD160:
    68 for the SL-R, 67 for the HD140
    There's a feeling I get
    When I look to the West
    And my spirit is crying for leaving

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