Viewing 12 posts - 1 through 12 (of 12 total)
  • Anyone love working with angles?
  • Conan257
    Free Member

    So I have an issue now that my head angle is far too steep. But I’m trying to be scientific rather than just buying new forks which are bigger.

    I’ve put a longer shock on my Stumpjumper 120, an increase of 10mm shock length and 3mm stroke.

    A 47mm stroke shock gives 120mm travel, so an extra 10mm of shock length pushes the rear wheel down by around 25mm, as well as an increase in BB height and steeper head angle. To counteract this I would like longer forks which will give a known output.

    I’m currently using 2009 Revelations (130mm). I believe these have an axle-crown of 509mm. Using sketchup and some photo’s, it appears I’m running a head angle of 72 degrees.

    I’m working on an output of 68 degree head angle, to produce this I need to move the headtube upwards around 73mm, ready reckoning of 0.5 degrees per 10mm gives me a near-as-dammit confidence check on that too.

    Any arguments against my theory? If not, I just need to find a nice bargain fork (probably 160mm)!

    Rorschach
    Free Member

    You will end up with a bike on stilts,high bb’ed,slack seat angled behemoth (if the headtube does’nt get ripped off first).

    ojom
    Free Member

    i think you are over thinking it. go for a ride…

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    scaredypants
    Full Member

    yeah, change your frame, I think

    cynic-al
    Free Member

    160mm forks on a 120mm frame?

    Are you serious?

    Conan257
    Free Member

    A frame change is in the workings, but pennies are limited!

    Stock setup of the bike is 70.5, so I only need to find a couple of degrees from the look of it….

    stevomcd
    Free Member

    I have a nice 165mm travel frame for sale. Cheap. This would be a much more sensible approach!

    andyl
    Free Member

    slackset headset?

    or offset shock bush?

    Rorschach
    Free Member

    Would have been better off with original shock,offset bushes and a works components -1 angleset.

    jivehoneyjive
    Free Member

    Pennies may be limited, but you can’t buy braincells~ please try and use the ones you have left and realise this is not the greatest idea~ surely if you can accept that a dodgy head angle will affect your riding, you can also grasp that a BB height requiring a ladder to mount the bike might not do you any favours, combine that with the additional leverage on the headtube and you’re well on your way to a Darwin award… nonetheless, please post pics when you prove us all wrong and have a wealth of happy customers for your aftermarket upgrade kit.

    cynic-al
    Free Member

    why are you doing this?

    Cheap fix to fubared original shock?

    Seriously, give it up, your BB will be too high, and that’s only the start.

    tomaso
    Free Member

    Offset shock busings would get you part the way there with the standard shock. Whack in a 140mm fork and you’d be close to the desired head angle. And it has a chance of still being nice to ride.

Viewing 12 posts - 1 through 12 (of 12 total)

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