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  1. #1
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    Tube ID help needed

    Just going through an old tube set my brother Jerry gave me. I recall him telling me it to be a full 531 set from the 80's and some Columbus tubing as well. I need a tube ID. There is no manufacturer stamp either end of the tube. Unfortunately I cannot get a picture so it will be a manual description only.

    The tube is chain stay length 48cm, tapered to about 11 mm on small end and 22 mm on large end. Tube is completely round with a tapered length. The odd thing is the 22mm end is drawn down from the 24mm section before it. The 22mm end is about 35mm in length.

    So picture it like this: small end starts at 11mm and tapers up to 24mm, then abruptly is squeezed down to a 22mm round section 35mm long.

    If I recall correctly Jerry was going to build a track frame so could this be a chain stay or fork tube from a track tube set?

  2. #2
    Andrew R Stewart Andrew R Stewart's Avatar
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    Sounds like a Reynolds tube to me. IIRC they made these chain stays to be stiffer yet still fit common lugged shells. I've seen a few and always thought they looked odd and not for my tastes. Andy.

  3. #3
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    Thanks for the input. So I can use it as a chain stay. Should turn out to be interesting as I am working on building a lugged adventure touring 29er.

  4. #4
    Andrew R Stewart Andrew R Stewart's Avatar
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    I would think that the incerase to the 24mm diameter would just worsen the tire clearance. Andy.

  5. #5
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    Andrew you are correct if they are left round. Since I must squish the tube to a narrower cross section, the starting diameter should not matter unless there is limiting ratio that cannot be exceeded.

  6. #6
    Andrew R Stewart Andrew R Stewart's Avatar
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    Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Raleigh Pro, Trek Cycle Cross, Mongoose tomac ATB, GT Bravado ATB, JCP Folder
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    The limiting ratio is zero, or flat... Really I don't think there would be any difference in working these stays. Just more squishing needed. Andy.

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