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  1. #1
    mtbr member
    Join Date
    Apr 2010

    explain head tube angle

    what effect does more or less h.t. angle have on the bike,
    how do you measure h.t. angle the bike just standing on its own or sitting on it
    what do you measure h.t. angle with
    how much does -1 or -2 degrees of ht angle affect bb height

    pros and cons on slacker ht. angle...

    thanks for some info....

  2. #2
    Huffy Rider
    Reputation: motochick's Avatar
    Join Date
    Jun 2010
    I will try to keep it very simple. HT angles have to do with the frame geometry, the fork length (A to C) and even tire size and headsets can affect it. Cross country bikes are generally steep 69-70 because they do not spend a lot of time going down steep stuff and are more concerned with pedaling and tighter turns. Downhill bikes are slacker 63-64 because they are going fast down steep stuff. The slacker the bike the less chance you will be going over the bars on steep terrain. Slacker bikes generally have a lower BB height. 1 degree of HT angle change either way is quite noticeable.

    Pros of slack- super stable at high speeds going down super steep stuff
    Cons of slack- harder to turn, not as easy to jump (generally) poor at pedaling

    Hard to measure, generally go by manufacturer specs. There are some apps that you can put on the fork tube, YMMV

    hope this helps some

  3. #3
    Big Gulps, Alright!
    Reputation: Berkley's Avatar
    Join Date
    May 2007
    Axle Standards Explained

    Founder at North Atlantic Dirt, riding & writing about trails in the northeast.

  4. #4
    mtbr member
    Join Date
    Sep 2012
    Is it possible to change head tube angle? By how much and which direction? (steep to slack or slack to steep)
    They call me non-sequitur

  5. #5
    Slap happy crappiness
    Reputation: DHgnaR's Avatar
    Join Date
    Feb 2008
    Quote Originally Posted by Gypsymage View Post
    Is it possible to change head tube angle? By how much and which direction? (steep to slack or slack to steep)
    Yep. There's lots of different ways which also very in the amount of change that occurs. Specific headsets to change your HA are available, a change in axel to crown height will change your HA which can be done by changing forks, or adjusting fork travel. Small changes in HA happen with tire size. Some frames you can flip suspension links or modify them to change your head angle, and you can even run different length rear shocks to change the HA. Some of these methods are not ideal or even dangerous depending on you specific frame, and results will vary but you can expect a change from very minimal to a few degrees.
    I'd rather have a bottle in front of me than a frontal lobotomy.

  6. #6
    Rider, Builder, Dreamer
    Reputation: sambs827's Avatar
    Join Date
    Dec 2008
    Quote Originally Posted by Berkley View Post
    you're back from lurking in the shadows, eh? Also ditch that signature and copy the OSCMTB youtube channel in there instead.
    Go ride your bike.

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