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Underseat Steering Bacchettas

Discussion in 'Homebuilt and Modifications' started by bentman1953, Dec 25, 2014.  |  Print Topic

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  1. bentman1953

    bentman1953

    Region:
    SouthEast
    State/Country:
    MI
    City:
    Ann Arbor
    Ride:
    Challenge
    Name:
    Joe
    Why a bolt through?

    I'm not sure of your question. I think that you are asking, "Why bother with a bolt or head tube?" "Why not just hook up directly to the fork, like the Vision did?"

    Well, the front fork on the Bacchetta is too far away from the seat for a direct hook-up. The sides of the handlebar would hit the sides of the seat before you turned the front wheel any appreciable amount.

    I saw a video of a Carbent, where the manufacturer hooked up a handlebar directly to the front fork. The Carbent has similiar front fork to seat spacing as the Bacchetta. Anyway, the handlebars stuck out to the sides about a foot and a half each side and looked strange and unwieldy to say the least.
     
    bentman1953, Jan 15, 2015
    #16
  2. ReverendJim

    ReverendJim

    Region:
    NorthEast
    State/Country:
    NJ
    City:
    Hasbrouck Heights
    Ride:
    Linear, Rans
    Name:
    Jim
    Why not just use the head tube for both bikes?
     
    ReverendJim, Jan 15, 2015
    #17
  3. bentman1953

    bentman1953

    Region:
    SouthEast
    State/Country:
    MI
    City:
    Ann Arbor
    Ride:
    Challenge
    Name:
    Joe
    Why not use the headtube on both bikes?

    I built the 700 Giro with the bolt, first. After experiencing that method, I went into the added on head-tube of the Giro 20.
     
    bentman1953, Jan 16, 2015
    #18
  4. Lawnchair Limo

    Lawnchair Limo

    Region:
    East
    State/Country:
    TN
    City:
    Knoxville
    Ride:
    Longbike Gulfst
    Name:
    Dwight
    I have a Longbike Gulfstream tandem with underseat steering. Your set up is much better than what I have. I especially like the head tube version. Mine is a single bolt through the frame. It steers fine but the handlebars get wobbly over time until I snug 'em up. Seems to me a head tube arrangement would make the pivot very stable. My only concern would be the added weight. Our bike is already a behemoth.
     
    Lawnchair Limo, Jan 16, 2015
    #19
  5. bentman1953

    bentman1953

    Region:
    SouthEast
    State/Country:
    MI
    City:
    Ann Arbor
    Ride:
    Challenge
    Name:
    Joe
    Bolt vs headtube

    I agree about the slop in the bolt setup.

    I don't think that there is much of a weight penalty, though. The headtube is not as beefy as you might think. After that the headsets and steerer tube are all standard bike parts, so weight was considered in their manufacture.

    I haven't had the, dual headtube, bike out as much this winter as I'd like. (In Michigan we seem to be in a permanent polar vortex.) So, I need to put some serious miles on the dual headtube before I'll know if there are any problems with it.
     
    bentman1953, Jan 17, 2015
    #20
  6. Bentbiker

    Bentbiker

    Region:
    Middle
    State/Country:
    OH
    City:
    Gibsonburg
    Ride:
    Giro
    Hi joe, I know this is an old thread, hoping you see. Parkinson’s is forcing me to USS. I live in Toledo area. Could you email me jpricehall at gmail
     
    Bentbiker, Feb 19, 2021
    #21
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