The physics of head tube angle and climbing-
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  1. #1
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    May 2008

    The physics of head tube angle and climbing

    Say you have a bike with an adjustable head tube able -- it adjusts from 69 deg to 71 deg. How much of an impact will the slacker HTA have on looong slow climbs up the side of a mountain?

  2. #2
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    Reputation: Ktse's Avatar
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    Jul 2008
    If your technique is good, a slacker angle between 69 and 71 is not going to be that big of a difference. Otherwise all things being equal, the slacker head tube angle will mean that the front wheel is more prone to wander a bit.

  3. #3
    esd is offline
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    Oct 2011
    Wouldn't the slacker head tube angle increase the wheelbase length, thereby keeping the front wheel more planted? I am not sure that this would translate into a wandering front wheel.

  4. #4
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    Sep 2011
    i'm thinking about it like a motorcycle. on motorcycles with more rake (HTA) like on choppers or cruisers, the front wheel is more stable. on sport bikes with less rake, they're less stable (at higher speeds) but handle better. maybe wheelbase has something to do with it?

    not sure if this really answers the OP's question though....

  5. #5
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    Reputation: GTscoob's Avatar
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    Apr 2009
    And most slack AM type bikes run short top tubes/reach. This keeps the wheelbase in check as well as providing a playful feeling bike on the DH.

    Too slack keeps the weight back on the bike making it more likely to loop out on steep climbs. Too steep of a HA makes the front end twitchy, meaning you have to concentrate on keeping the handlebars steady when climbing out of the saddle.

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