Vent Hole Question on Mtn Cruiser Frame- Mtbr.com
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  1. #1
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    Vent Hole Question on Mtn Cruiser Frame

    Question for those that have built a klunker/cruiser type frame (similar to this: https://bmxmuseum.com/bikes/cooks_brothers/75705).

    My question is about venting the middle tube that runs from the ST to the DT. There will be a vent hole on the ST end (vent hole in the ST), but I’m not sure what to do at the DT end. Did you also put a vent hole in the DT?

    I was leaning toward just a small “weep” hole on the underside of the middle tube and not putting a larger vent hole in the DT, but curious what others have done.

    Thanks!!

  2. #2
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    Personally, I would only have a vent hole into the ST and leave the DT. I am a brazer so you need a hole to allow expanding gases to escape and you only need 1 hole for this to happen.

    Eric
    If I don't make an attempt, how will I know if it will work?

  3. #3
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    Thanks Eric. It seemed to me that drilling a hole in the DT wasn’t necessary. I’m just in the habit of vent holes at all front triangle joints. I’ll probably still put a weep hole on the underside of the middle tube, near the DT. It’ll be fillet brazed so I want to allow some water flow to clean out flux.

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