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  1. #1
    Senior Member The MAX's Avatar
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    What is this? Weird frame nub content...

    So I just finished fixing up a 92 (I think) Giant Yukon. Nothing real top of the line, but a solid bike, and will make a great commuter for someone.



    And I noticed this weird braze-on/nub on the non drive side chain stay. Never seen one before and can't even imagine what it might be for. Any ideas? I thought it might be something to do with the quick release lever, but the lever doesn't even touch it.

    Adventures In Bicycling

    '84 Miyata Terra Runner
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    Surly Long Haul Trucker

  2. #2
    Senior Member Captain Blight's Avatar
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    That is weird. When you figure it out be sure to let us know.
    '71 Raleigh Super Course ("Loose Change")
    '74 Raleigh Professional
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  3. #3
    Senior Member
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    might be a fixture for a proprietary rack, or maybe a fancy mounting point for the brake arm of a coaster brake hub... IDK.

  4. #4
    Senior Member Grand Bois's Avatar
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    I'm stumped, but very curious. Clean up the rust on that QR before you try to sell it!

  5. #5
    Senior Member brian3069's Avatar
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    I have the identical bike, never notice that.

  6. #6
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    I'm guessing an anti-rotational nub for a rear kick stand, but that's a guess.

  7. #7
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    Quote Originally Posted by bobdell View Post
    I'm guessing an anti-rotational nub for a rear kick stand, but that's a guess.
    I agree with that conjecture.

  8. #8
    Senior Member Fenway's Avatar
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    Would make sense with the two bolt holes in that dropout.

  9. #9
    Freewheel Medic pastorbobnlnh's Avatar
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    I'm guessing a mounting and anti rotational nub for a disc brake system.
    Bob
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  10. #10
    Bianchi Goddess Bianchigirll's Avatar
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    I think that bike is too old for a brazeon for a disc brake. I lik the Kickstand idea or maybe something for a kid trailer?
    Bianchis '87 Sport SX, '90 Proto (2), '91 Boarala 'cross, '93 Project 3, '88 Trofeo, '86 Volpe, '89 Axis, '79 Mixte, '99 Mega Pro XL Ti, '97 Ti Megatube, , '90 something Vento 603,

    Others but still loved,; '80 RIGI, '80 Batavus Professional, '87 Cornelo, '86 Bertoni (sold), '09 Motobecane SS, '98 Hetchins M.O., '09 K2 Mainframe, '89 Trek 2000, '?? Jane Doe (still on the drawing board), '90ish Haro Escape

  11. #11
    Senior Member Grim's Avatar
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    Was the frame assembled in a automated welder? Might be for indexing purposes.
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