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  1. #1
    Senior Member VT tallbike's Avatar
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    Tubing Size Help

    I'm going to be ordering some tubing for a cargo bike and to make things simple I'd like to limit it to one size. I want to be able to use a size that will accept a 1 /18 headset cup. Does anyone know what the ID of a 1 1/8 headtube is?

  2. #2
    holyrollin' FlatTop's Avatar
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    Jun 2005
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    Park Tool says 33.8 or 33.9mm inside diameter of the headtube, for an interference fit of the bearing cups. This is for both threaded and threadless headsets.
    I'm thinking that some work with a caliper will be needed to select the closest tubing size. It may be necessary to ream to final size.
    Your construction plan sounds interesting. I'd like very much to hear more of the details.

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