How can I measure head tube angle?- Mtbr.com
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  1. #1
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    Reputation: Porchsong's Avatar
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    How can I measure head tube angle?

    Yes, I've used the search function with no luck.

    Can anyone please point me to a thread or kindly let me know how to measure my rides HA?

    Thanks,

    Porch
    "If we were Vikings, Rocky Mountain aspen stands would be our Vahalla and its singletrack our bounty" - Mtn Flyer Mag #14

  2. #2
    AZ
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    Place bike on level surface , place angle finder on head tube . You can also search bikepedia or the Santa Cruz site for specs .

  3. #3
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    ok....thanks

    My frame / fork combo is uncommon, therefore it is not included within SCB.com.

    - original Nomad w/ a DUC32 - I'm researching my next rig and I want to make sure that I don't end up with a steeper HA.

    "angle finder" - that's kind of the point to my question. I do not own an "angle finder", but I have a garage full of tools. Is there any way to measure it w/o a specific angle finder tool?

    Thanks,

    Porch
    "If we were Vikings, Rocky Mountain aspen stands would be our Vahalla and its singletrack our bounty" - Mtn Flyer Mag #14

  4. #4
    nerfherder
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    If memory serves the DUC32's axle to crown measurement is within a few mm of a RS Pike. So if you need a comparison use the Pike which is more likely to show up on a bike builder.

    Google search tells me:

    DUC32 a2c: 520mm
    Pike a2c: 517mm

    If you have an iphone you can download an angle finder app. If you don't have an angle finder I'm sure you could bust out your high school geometry skills and run some calculations. Don't we all remember that stuff?

    Uh... no.

    Hope that helps.

  5. #5
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    thanks

    thanks, according to this thread the DUC is 517

    http://forums.mtbr.com/showthread.ph...n+measurements

    This sounds like a great excuse to go purchase a angle finder, I love tools.

    I'm attempting to compare the GEO of my rig to the new BLTc with a variety of different forks.
    HA is only one of many factors I'm dreaming about.

    Cheers.

    Porch
    "If we were Vikings, Rocky Mountain aspen stands would be our Vahalla and its singletrack our bounty" - Mtn Flyer Mag #14

  6. #6
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  7. #7
    Calm Like a Bomb
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    I purchased a digital angle gauge as I love tools too but you can measure the HA with a regular protractor. All you need to do is extend the fork leg with a ruler so the rule touches the floor and then measure the corresponding angle.

    But as mentioned I love tools and I have a few bikes including my wife's so I purchased a digital angle gauge like the one in the link:

    http://www.craftsmanstudio.com/html_p/C019003.htm
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  8. #8
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    seems like you could also use a piece of string and a protractor...

  9. #9
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    string?

    as a plumbob?

    yeah I guess your right that should work fine.

    cool little digital (box) angle finder!

    Thanks,

    Porch
    "If we were Vikings, Rocky Mountain aspen stands would be our Vahalla and its singletrack our bounty" - Mtn Flyer Mag #14

  10. #10
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    You can use a tool like this - just put it on the head tube or fork leg. Also that digital one is pretty cheap and cool. $28? hmmmm.


    or
    "It looks flexy"

  11. #11
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    put it on the head tube. if there's a badge, you might need to put two spacers on the angle finder to go around the headtube badge.

    the fork legs are not necessarily parallel to the steerer tube/head tube.
    Originally posted by bucksaw87
    I still fail to see how mustaches, fixies, and PBR are ironic.

  12. #12
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    Quote Originally Posted by Porchsong
    Can anyone please point me to a thread or kindly let me know how to measure my rides HA?
    Take a photo of the bike with your digital camera. Upload the photo to your computer and use a photo editing program to determine the HTA (and any other angles of interest).

  13. #13
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    ok...

    I picked up one of the little digital angle finders and measured my HA. Cool little tool.

    My rig: original Nomad w/ a DUC32. I just measured the HA at 68.8 degrees.

    SCB.com lists the HA for the original Nomad as 67 deg with a disclaimer that all Geo is based on a 545mm A2C fork. I believe that the A2C for the DUC32 is 517mm.
    I re-measured several times, and came up with the same result, 68.8. Does my measurement sound accurate?

    The BLTc HA is listed as 69 deg w/ a 515mm fork. So "if" i were to match a BLTc up with my DUC32 the HA should be right around 69 deg - correct?

    lets keep this a geo thread not a DUC32 thread please.

    Any comments are welcome. Thanks.

    Porch
    "If we were Vikings, Rocky Mountain aspen stands would be our Vahalla and its singletrack our bounty" - Mtn Flyer Mag #14

  14. #14
    Seeeriously easy Livin
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    That's a steep nomad, I really want to know the ha of my bike now. If I just keep telling myself it's 67, then eventually it will be true right...

  15. #15
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    I have not personally validated it but I know folks are using it, self included. If you have an Ipod Touch or Phone its a free app or at most 99 cents. There are a few, e.g., clinometer


  16. #16
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    I've used a clinometer app on my iPhone and it measures the HA, ST angles perfectly. On my 2007 SL with the fork at 100mm the HA is 71.0, at 130mm it is 69.0

  17. #17
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    Quote Originally Posted by SedonaSL
    I've used a clinometer app on my iPhone and it measures the HA, ST angles perfectly. On my 2007 SL with the fork at 100mm the HA is 71.0, at 130mm it is 69.0
    yeah, its pretty cool. even the guys at PUSH were spotted using it

  18. #18
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    Quote Originally Posted by Flystagg
    That's a steep nomad ...
    Ya, that's why I'm attempting to estimate what the HA would be on a new rig.

    I'd like to maintain my current HA or slightly slacker, but not the other way.

    Porch
    Last edited by Porchsong; 09-22-2009 at 12:38 PM.
    "If we were Vikings, Rocky Mountain aspen stands would be our Vahalla and its singletrack our bounty" - Mtn Flyer Mag #14

  19. #19
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    Quote Originally Posted by FoShizzle
    yeah, its pretty cool. even the guys at PUSH were spotted using it
    So does that program work on the ipod full screens? I don't remember what they are called, but they look like an iphone without the phone part.
    "It looks flexy"

  20. #20
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    Yes, the clinometer apps work on the iPhone and iPod Touch (basically same at the iPhone without the phone). The app I use is called AppBox Pro. It has a bunch of utility apps included, one is a Clinometer. I think it cost $0.99 or $2.99.

  21. #21
    Calm Like a Bomb
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    Using the digital angle gauge I posted previously the HA on my Nomad is 66.7*.

    Setup:

    Lyrik at 160mm
    Cane Creek XC II Flush headset
    Maxxis Minion DHF 2.5" inflated to 30psi

    The thing with the gauges is that you have to have the bike perfectly upright to achieve an accurate reading. It can't be leaning more to one side or the other.
    '17 Hatchet Carbon
    '17 Troy Carbon
    '16 Django Carbon
    '16 Wilson
    '16 Farley 5

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  22. #22
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    Apparently it's free right now.....
    https://www.appstoreapps.com/2009/01...ee-clinometer/

    Quote Originally Posted by FoShizzle
    I have not personally validated it but I know folks are using it, self included. If you have an Ipod Touch or Phone its a free app or at most 99 cents. There are a few, e.g., clinometer

    "It looks flexy"

  23. #23
    Lord of the Chainrings
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    I have one of these....
    Attached Images Attached Images
    "Hesitation is the Mother of Failure!"

    ~~ 951 for Dirt & Roadster for Asphalt ~~

  24. #24
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    great idea

    Thanks, works on iPhone 4 and was .99 cents.

    Quote Originally Posted by FoShizzle View Post
    I have not personally validated it but I know folks are using it, self included. If you have an Ipod Touch or Phone its a free app or at most 99 cents. There are a few, e.g., clinometer


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