Stainless steel rim bent - repair?

Discussion in 'Technical Chat' started by David WE Roberts, Jul 29, 2011.

  1. Having removed the tube (exploded) and tyre from my Dutch bike I noticed
    that the stainless steel rim was splayed outwards at one point.
    Strange - it looked as though it had just been splayed out, not flattened as
    you might expect if the rim had been smacked against a hard object without
    the protection of an inflated tyre.
    No obvious flat spot.

    So is there any reasonable way to repair this?
    Such as gentle squeezing with a vice?
    Or is the rim due to be scheduled for replacement?
    Worryingly, although there is only slight symetrical bow out along both
    sides of a small section of rim this is about where the tube blew.
    [Please note, I did try Google first.]

    I also struggled to get the tyre and tube off.
    The rear hub is a Shimano Nexus SG-7R46 7 speed hub with internal gears and
    internal brake.
    I worked out that I should disconnect the brake cable and the bracket which
    held the assembly to the frame to stop the brake parts rotating, but the
    gear cable seems to be embedded into the hub and not easy to release.

    I ended up dropping the wheel just out of the forks so there was enough
    clearance to get the tube and tyre off on the brake side, but this didn't
    feel particularly sophisticated.
    Can anyone tell me the correct way to do this?
    This is the first time I have had to do anything to the bike, which
    generally seems to be built like a tank.

    Cheers

    Dave R

    P.S. Lidl workstand is performing well so far once I tightened up a loose
    clamp.

    --
    No plan survives contact with the enemy.
    [Not even bunny]

    Helmuth von Moltke the Elder

    (\__/)
    (='.'=)
    (")_(")
     
    David WE Roberts, Jul 29, 2011
    #1
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  2. David WE Roberts

    Phil Cook Guest

    That should be OK steel being a nice ductile kind of material you can
    bash it back into shape no problems.
    Shimano tech docs are available on-line as pdfs.

    http://techdocs.shimano.com/techdocs/index.jsp

    http://tinyurl.com/3z6gzjl covers your hub and

    http://tinyurl.com/3gv5fvw the connection of the cable to the hub.
     
    Phil Cook, Jul 29, 2011
    #2
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  3. Magic - thanks Phil.
    I found a exploded diagram of the hub but hadn't found the instructions.

    --
    No plan survives contact with the enemy.
    [Not even bunny]

    Helmuth von Moltke the Elder

    (\__/)
    (='.'=)
    (")_(")
     
    David WE Roberts, Jul 29, 2011
    #3
  4. <snip>

    Not the best news on that front.
    The rim appears to be hollow - that is it seems to be a double skin instead
    of being made from a solid piece of metal.
    This explains the tiny holes all round the inside of the rim near the tyre
    wall - expansion holes.
    It may also explain the gentle sissing noise when the rim is rotated -
    preumably bits of stuff inside the cavity within the wheel rim.
    However this does mean that beating it with a hammer may not be productive
    :-(
    I fear that this would just collapse the cavity.

    Cheers

    Dave R
    --
    No plan survives contact with the enemy.
    [Not even bunny]

    Helmuth von Moltke the Elder

    (\__/)
    (='.'=)
    (")_(")
     
    David WE Roberts, Jul 29, 2011
    #4
  5. David WE Roberts

    David Guest

    "David WE Roberts" wrote in message
    Stainless steel rims?
    I didn't know they existed. They most cost a small fortune!
     
    David, Jul 29, 2011
    #5
  6. David WE Roberts

    nmm1 Guest

    Not at all. The material isn't expensive nowadays, and is very
    good together with hub or disk brakes.


    Regards,
    Nick Maclaren.
     
    nmm1, Jul 29, 2011
    #6
  7. David WE Roberts

    Peter Clinch Guest

    Peter Clinch, Jul 29, 2011
    #7
  8. David WE Roberts

    Rob Morley Guest

    Often works fine. Use wooden blocks to spread the load so it doesn't
    kink the rim. Tape/band them on so you don't need three or four hands.
    Either whacked on a kerb/pothole, spreading the rim and damaging the
    tyre but you didn't notice at the time, or the tyre wasn't seated
    properly and escaped over the edge?
     
    Rob Morley, Jul 30, 2011
    #8
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