• cable fray fix

    From Mark J cleary@21:1/5 to All on Thu Nov 14 15:10:03 2024
    I just put a new rear derailleur cable on my Habanero disc bike. I
    managed to easily get it working with buried cables in the tubes. This
    because Habby frames have a plate that can open up to allow cable to
    snake inside much easier. Smart move by the designer.

    Then I go to cut the excess and not much room for extra cable. The cable
    will hit the spokes unless it us cut almost back to the cable anchor
    bolt. So when doing this is was not careful and cut it and it frayed all
    the way back to the anchor. Of course it is already on so the bike
    shifts fine and should pose no problem. However it is sloppy looking and
    no way to get a end cap on the keep in all together.

    Outside of twisting and twisting until you get it which is frustrating I
    decide to use heat shrink tubing. I put on two separate pieces and
    manage to get it all bunched up. It seems to work but is there any other
    thing you can do? I could replace the cable but frankly is works fine
    and maybe just overkill. I wish I could get some form of a crimp cap
    that would fit over the tubing to make it a bit more sturdy. Don't know
    any any here know?
    --
    Deacon Mark

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  • From Zen Cycle@21:1/5 to Mark J cleary on Thu Nov 14 17:03:31 2024
    On 11/14/2024 4:10 PM, Mark J cleary wrote:
    I just put a new rear derailleur cable on my Habanero disc bike. I
    managed to easily get it working with buried cables in the tubes. This because Habby frames have a plate that can open up to allow cable to
    snake inside much easier. Smart move by the designer.

    Then I go to cut the excess and not much room for extra cable. The cable
    will hit the spokes unless it us cut almost back to the cable anchor
    bolt. So when doing this is was not careful and cut it and it frayed all
    the way back to the anchor. Of course it is already on so the bike
    shifts fine and should pose no problem. However it is sloppy looking and
    no way to get a end cap on the keep in all together.

    Outside of twisting and twisting until you get it which is frustrating I decide to use heat shrink tubing. I put on two separate pieces and
    manage to get it all bunched up. It seems to work but is there any other thing you can do? I could replace the cable but frankly is works fine
    and maybe just overkill. I wish I could get some form of a crimp cap
    that would fit over the tubing to make it a bit more sturdy. Don't know
    any any here know?

    First off, I really like the heat shrink idea. I wish I would have
    though of that! I usually twist the strands back together with pliers
    and hold them in place enough to get the cap on, yeah, it's a PItA. but
    it doesn't solve the interference problem.

    When I have an interference I normally bend the cable in the direction I
    need it to go with a pair of pliers (held perpendicular to the cable) so
    that the wire permanently (more or less) stays out of the way. I've
    never had it be an issue on the rear derailleur that I can recall, but
    its happened on most of the front derailleurs such that the cable will
    graze my calf while pedaling. Another area I had to do that was the rear
    brake cable on my CX bike with the V brakes, the cable came out far
    enough that I would graze it occasionally when remounting.

    Hope this helps.

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  • From AMuzi@21:1/5 to Mark J cleary on Thu Nov 14 16:13:02 2024
    On 11/14/2024 3:10 PM, Mark J cleary wrote:
    I just put a new rear derailleur cable on my Habanero disc
    bike. I managed to easily get it working with buried cables
    in the tubes. This because Habby frames have a plate that
    can open up to allow cable to snake inside much easier.
    Smart move by the designer.

    Then I go to cut the excess and not much room for extra
    cable. The cable will hit the spokes unless it us cut almost
    back to the cable anchor bolt. So when doing this is was not
    careful and cut it and it frayed all the way back to the
    anchor. Of course it is already on so the bike shifts fine
    and should pose no problem. However it is sloppy looking and
    no way to get a end cap on the keep in all together.

    Outside of twisting and twisting until you get it which is
    frustrating I decide to use heat shrink tubing. I put on two
    separate pieces and manage to get it all bunched up. It
    seems to work but is there any other thing you can do? I
    could replace the cable but frankly is works fine and maybe
    just overkill. I wish I could get some form of a crimp cap
    that would fit over the tubing to make it a bit more sturdy.
    Don't know any any here know?

    We cut and cap the wire, then bend it to clear the spokes.
    Bending the wire before cutting causes the wire to fray, as
    you found.

    --
    Andrew Muzi
    am@yellowjersey.org
    Open every day since 1 April, 1971

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  • From Zen Cycle@21:1/5 to AMuzi on Thu Nov 14 17:23:20 2024
    On 11/14/2024 5:13 PM, AMuzi wrote:
    On 11/14/2024 3:10 PM, Mark J cleary wrote:
    I just put a new rear derailleur cable on my Habanero disc bike. I
    managed to easily get it working with buried cables in the tubes. This
    because Habby frames have a plate that can open up to allow cable to
    snake inside much easier. Smart move by the designer.

    Then I go to cut the excess and not much room for extra cable. The
    cable will hit the spokes unless it us cut almost back to the cable
    anchor bolt. So when doing this is was not careful and cut it and it
    frayed all the way back to the anchor. Of course it is already on so
    the bike shifts fine and should pose no problem. However it is sloppy
    looking and no way to get a end cap on the keep in all together.

    Outside of twisting and twisting until you get it which is frustrating
    I decide to use heat shrink tubing. I put on two separate pieces and
    manage to get it all bunched up. It seems to work but is there any
    other thing you can do? I could replace the cable but frankly is works
    fine and maybe just overkill. I wish I could get some form of a crimp
    cap that would fit over the tubing to make it a bit more sturdy. Don't
    know any any here know?

    We cut and cap the wire, then bend it to clear the spokes. Bending the
    wire before cutting causes the wire to fray, as you found.

    oops, yeah, forgot that part, cap first, _then_ bend.

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  • From AMuzi@21:1/5 to Frank Krygowski on Thu Nov 14 17:29:08 2024
    On 11/14/2024 5:00 PM, Frank Krygowski wrote:
    On 11/14/2024 4:10 PM, Mark J cleary wrote:
    I just put a new rear derailleur cable on my Habanero disc
    bike. I managed to easily get it working with buried
    cables in the tubes. This because Habby frames have a
    plate that can open up to allow cable to snake inside much
    easier. Smart move by the designer.

    Then I go to cut the excess and not much room for extra
    cable. The cable will hit the spokes unless it us cut
    almost back to the cable anchor bolt. So when doing this
    is was not careful and cut it and it frayed all the way
    back to the anchor. Of course it is already on so the bike
    shifts fine and should pose no problem. However it is
    sloppy looking and no way to get a end cap on the keep in
    all together.

    Outside of twisting and twisting until you get it which is
    frustrating I decide to use heat shrink tubing. I put on
    two separate pieces and manage to get it all bunched up.
    It seems to work but is there any other thing you can do?
    I could replace the cable but frankly is works fine and
    maybe just overkill. I wish I could get some form of a
    crimp cap that would fit over the tubing to make it a bit
    more sturdy. Don't know any any here know?

    I've got a special cable cutter, a hand operated shear whose
    each jaw has a V groove with cutting edges. This means the
    cable is cut simultaneously from four directions. It's never
    caused fraying.

    Back before stainless steel cables, there were a few times I
    soldered the strands together before cutting. That gave a
    very neat finish. But AFAIK that won't work with SS cables.

    To fix the problem after the fact, maybe you could have
    applied cyanoacrylate ("Crazy") glue as you twisted? Or
    better, apply it to the cut spot before you cut?

    Overall, it seems like a very, very small aesthetic problem.
    I wouldn't worry about it. What you did works.

    Related: I use bar end friction shifters on most of my
    bikes. When their cables break, it's normally at the
    shifter; and it's happened far, far from home. Since then, I
    usually leave a few inches extra cable past the cable clamp
    as a sort of spare cable reservoir, and sort of tie it into
    a loop, maybe an inch in diameter. If a break occurs, I can
    feed the extra cable back upstream and tie the broken end
    into a knot to replace the cast cable end, to get me home.
    But I now usually have a spare cable with me, especially
    since my cable routing requires an extra long cable.


    Can't do that with RD-6800 and similar; there's precious
    little space beyond the anchor bolt.

    --
    Andrew Muzi
    am@yellowjersey.org
    Open every day since 1 April, 1971

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  • From sms@21:1/5 to Mark J cleary on Thu Nov 14 18:09:38 2024
    On 11/14/2024 1:10 PM, Mark J cleary wrote:

    <snip>

    Outside of twisting and twisting until you get it which is frustrating I decide to use heat shrink tubing. I put on two separate pieces and
    manage to get it all bunched up. It seems to work but is there any other thing you can do? I could replace the cable but frankly is works fine
    and maybe just overkill. I wish I could get some form of a crimp cap
    that would fit over the tubing to make it a bit more sturdy. Don't know
    any any here know?

    I've used heat shrink in similar situations. It works fine, as long as
    you don't ever have to pull the inner wire back through the housing for
    any reason.

    It's very important to have a proper tool for cutting those inner wire
    and not try to use wire cutters. Inner wires made of stainless steel are
    very tough to cut without the proper tool.

    It's also very difficult to solder stainless steel cables, you need the
    proper flux, the proper solder, and a torch or very hot soldering iron,
    and you have to be careful not to melt the housing. Supposedly, acid
    flux should be used, or use hydrochloric acid (31.45% muriatic acid).

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  • From Mark J cleary@21:1/5 to sms on Fri Nov 15 10:52:28 2024
    On 11/14/2024 8:09 PM, sms wrote:
    On 11/14/2024 1:10 PM, Mark J cleary wrote:

    <snip>

    Outside of twisting and twisting until you get it which is frustrating
    I decide to use heat shrink tubing. I put on two separate pieces and
    manage to get it all bunched up. It seems to work but is there any
    other thing you can do? I could replace the cable but frankly is works
    fine and maybe just overkill. I wish I could get some form of a crimp
    cap that would fit over the tubing to make it a bit more sturdy. Don't
    know any any here know?

    I've used heat shrink in similar situations. It works fine, as long as
    you don't ever have to pull the inner wire back through the housing for
    any reason.

    It's very important to have a proper tool for cutting those inner wire
    and not try to use wire cutters. Inner wires made of stainless steel are
    very tough to cut without the proper tool.

    It's also very difficult to solder stainless steel cables, you need the proper flux, the proper solder, and a torch or very hot soldering iron,
    and you have to be careful not to melt the housing. Supposedly, acid
    flux should be used, or use hydrochloric acid (31.45% muriatic acid).

    I have a great cable cutter it cuts in snap. I think the problem was I
    just put pressure on the cable while cutting and like Andrew said the
    cause the fray. This is Shimano R7000 groupset and derailluer and the
    room for the cable to clear the spokes is barely over 1 inch maybe 1.5
    inches but nothing like the old days when you would snip the cable and
    have 3 inches showing and it would be fine. To me this does put stress
    on the cable after the pinch bolt. Todays 36 mile ride though was fine
    shifter great and glad I swapped out cable before it frayed on the end
    up in the shifter, that eventually happens if you don't swap out a new
    cable.

    --
    Deacon Mark

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