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  1. #1
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    New question here. Help with angles please - especially HA

    I've got a X5 2004 and i am currently running pikes and fox float on 6" rockers. The bike has quite a high BB (around 14"+). I know the angles changed from 70 deg in 2004 to 68.6deg from 2005 onward so i have not got a clue what my HA is.

    I have also read a couple of notes that say that each 20mm in fork (axle to crown length) is about 1 deg but elswhere i have seen 25mm = 1 deg.

    Does anybody have the definitive rule for each mm change in AC length vs HA change?

    I can have a gues at my HA but i am unsure what the change in rockers ie from 5" to 6" has done to the BB height and if this has affected the HA of the bike.

    just as a starter the 2004 angles are based on a AC of 478mm
    the 2005 onward 505mm and the pike is a 518mm (at 140mm)

    cheers for any help in advance


    Dave

  2. #2
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    The rule that I've always gone by is 10mm in A-C is equivalent to approximately .5 deg in HA. Now I could be wrong on this, so maybe someone else more knowledgeable will chime in here too. As far as what the 6" rockers do to the geometry of your X5, I have no idea. I've never seen or read anything about it.

  3. #3
    Shot Down in Flames...
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    Go buy one of these for $12.




    Takes the guessing out.


    D.

  4. #4
    Single Speed Junkie
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    Quote Originally Posted by D-Rock
    Go buy one of these for $12.




    Takes the guessing out.


    D.
    That won't work the frame is alloy

  5. #5
    Feeding your addiction
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    Quote Originally Posted by crux
    That won't work the frame is alloy
    You can hold it, with your hand.
    "It is inhumane, in my opinion, to force people who have a genuine medical need for coffee to wait in line behind people who apparently view it as some kind of recreational activity". - Dave Barry

  6. #6
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    Quote Originally Posted by Ventanarama
    You can hold it, with your hand.
    Exactly.

    D.

  7. #7
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    48" level

    While you are at the store pick up a framing level, so you can find a section of floor about 15" from a wall that is actually level, cheap ones are less than $15. Anyone with any brand of bike that messes with fork length and different tire diameters and linkage and shock lengths should spend a little more to know what they did and put that together with how it feels on the trail.

    DT

  8. #8
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    thanks for the reply lads but over here in Great Britain i cannot find one of those angle finders.

    and why 15" away from a wall?

  9. #9
    Bodhisattva
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    Quote Originally Posted by vortexracing
    thanks for the reply lads but over here in Great Britain i cannot find one of those angle finders.

    and why 15" away from a wall?
    minimizes the effect of gravitational force on the angle finder

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