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  1. #1
    Senior Member JonathanGennick's Avatar
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    Replacing water bottle boss

    Is there an easy solution to replacing a water-bottle boss in aluminum frame? This is a Rockhopper frame, aluminum, and the downtube is sort of square and flat in the location of the boss.

    The original boss broke loose. So now the kid I'm helping is stuck with about a 5/16ths-inch circular hole and no way to mount his bottle cage.

    I might pull the bottom bracket and see whether I can thread a bolt through coming in from that way. I am just wondering whether there might be an easier, off-the-shelf fix.

  2. #2
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    just get a new riv nut crimped unless the hole is smoked. we do it all the time. cost is like 10-20 bucks

  3. #3
    Senior member Dan Burkhart's Avatar
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    If the hole is not too badly oversized, a new Riv Nut can be installed. I like to use an epoxy like JB Weld for insurance. Did a couple of videos on this. The first one shows how you can install a Riv Nut without the tool.
    http://www.youtube.com/watch?v=E8ssW67QZRI
    http://www.youtube.com/watch?v=BETc5IkbvlY
    Gearhubs demystified and other cool stuff.


    The greatest mistake you can make in life is to be continually fearing you will make one. Elbert Hubbard.

  4. #4
    Senior Member JonathanGennick's Avatar
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    Quote Originally Posted by reptilezs View Post
    just get a new riv nut crimped unless the hole is smoked. we do it all the time. cost is like 10-20 bucks
    Hey! Are you the Boston Bike Mechanic? I follow your blog now and then.

    I googled "riv nut". Yeah, that looks like the way to go here. I will find out whether any of the nearby shops have the tool.

  5. #5
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    If the hole is blown out too large for another RivNut there are plenty of clamp-on cage mounts and bosses; one like this might do the trick: http://www.amazon.com/Elite-Universa.../dp/B001FTL3R4

  6. #6
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    Here is a source with numerous water bottle mounting methods: http://nordicgroup.us/cageboss/

  7. #7
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    Quote Originally Posted by JonathanGennick View Post
    Hey! Are you the Boston Bike Mechanic? I follow your blog now and then.

    I googled "riv nut". Yeah, that looks like the way to go here. I will find out whether any of the nearby shops have the tool.
    yea that's me. any service department worth their salt should have the tool.

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