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  1. #1
    Join Date
    Nov 2009
    Location
    Indianapolis, Indiana
    Posts
    10,956

    Question Bike Rack installation problem

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    I am trying to install a seat-post rack on my Gunnar - I just refuse to install a more traditional rack as I want it to be easy on and off. It is a Bontrager and it is quite simply to install, just 4 bolts. It comes with two shims in case it doesn't fit the seat-post. The problem is that neither DO fit mine, as the attached picture shows. No matter how tight I tighten the bolts - and I took the seat-post out and slid the sleeve over it, it just doesn't fit.

    What is the best material to use to fix this? I am thinking about just taking it to my LBS and letting them come up with something - but am I overlooking something obvious and easy? This is the first time I've actually tried to "do" anything to my bike outside of practicing how to change the tube...

  2. #2
    Join Date
    Jun 2008
    Location
    Abq, NM
    Posts
    309
    I wrapped one with black electric tape. How much space are you trying to fill?
    I also sliced some pvc for a big gap. Can you add washers to take up space?
    Lookit, grasshopper....

  3. #3
    Join Date
    Nov 2009
    Location
    Indianapolis, Indiana
    Posts
    10,956
    I don't want to wrap the post on my lovely custom Gunnar with tape - just vanity I suppose I only intend to use the rack when I am actually commuting or need it for other things, so most of the time it won't be there.

    There isn't much of a space, and I tightened the bolts so tight that the sleeve I used is still attached to it after I removed it from the bike - so I know it wasn't a problem of it not being tight enough. It isn't much space...I wonder if a thin rubber sleeve would work - assuming I can find such a thing? It would have the added benefit of protecting the post from being marked by the rack. I think a washer might be too thick but I could be mistaken.

  4. #4
    Join Date
    Sep 2007
    Location
    Uncanny Valley
    Posts
    14,645
    A strip cut from an old inner tube makes a nice non-marring shim. I would think if it's not thick enough you could make a longer strip and wrap it around once, but I wouldn't wrap it more than once since it could make the rack unstable.

    Another possibility would be the shims they make to put a narrow seatpost into a larger diameter seat tube. Those would be guaranteed to be the right size. But I think those are metal and might scratch your seatpost.
    Last edited by OakLeaf; 04-25-2012 at 03:02 AM.
    Speed comes from what you put behind you. - Judi Ketteler

  5. #5
    Join Date
    Nov 2009
    Location
    Indianapolis, Indiana
    Posts
    10,956
    Quote Originally Posted by OakLeaf View Post
    A strip cut from an old inner tube makes a nice non-marring shim. I would think if it's not thick enough you could make a longer strip and wrap it around once, but I wouldn't wrap it more than once since it could make the rack unstable.
    Good thought Oakleaf and one I hadn't considered. I don't have any "old" inner tubes, but I do have several extra and they aren't that expensive. I hope to FINALLY try my commuting route this Saturday - depending on what the rain does...
    Last edited by Catrin; 04-25-2012 at 04:11 AM.

  6. #6
    Join Date
    Jun 2008
    Location
    Abq, NM
    Posts
    309
    You could also try foam pipe wrap. Cheap enough, and won't scratch anything.
    Lookit, grasshopper....

  7. #7
    Join Date
    Sep 2007
    Location
    Uncanny Valley
    Posts
    14,645
    That would compress way too much to offer any stability, unless you're thinking of something different from the soft EPS stuff I put on my frame tubes when I pack the bike for shipping.
    Speed comes from what you put behind you. - Judi Ketteler

 

 

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