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  1. #1
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    Shimano inter 8 shifting issues.

    I have a fairly new, 2 moths old, shimano inter-8 hub that is now acting up. I installed the hub myself and after about a week, got it perfectly adjusted so all 8 gears worked great. Then suddenly after about a month or so of perfect operation gears 5-8 now want to skip. I can get gears 1-4 to shift as expected, but no amount of adjusting seems to want to fix the issue. I can get around fine on gears 1-4, but it would be nice to have the option to use those gears.

    I don't ride hard, and only apply light to moderate pressure on the pedals. Just enough to get going at a slow pace.

  2. #2
    coprolite fietsbob's Avatar
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    cable out of adjustment is the first thing to check, line up the 2 pitch marks ..

  3. #3
    Senior Member Wilfred Laurier's Avatar
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    it is my understanding
    that the nexus and alfine internally geared hubs
    are very finicky when it comes to cable routing

    a problem i have had when trying to kludge together a working bike
    is that if you use the wrong anti turn washers
    the cable has a very good chance of touching the chain
    which can make the shifting act like it has ants in its pants

    edit
    Quote Originally Posted by harshbarj View Post
    after about a week, got it perfectly adjusted so all 8 gears worked great
    this statement raises red flags for me

    nexus hubs generally have one adjustment to make
    and that is to set the cable tension so that the lines on the hub are lined up when the shifter is in the marked gear
    and if that adjustment is made correctly
    the hub should work perfectly the first time

    so

    please describe your setup including
    droupout type ie vertical or horizontal
    which anti rotation washers you are using
    how you have your cable routed
    and which shifters you are using

    a picture would be very helpful
    Last edited by Wilfred Laurier; 05-05-14 at 03:37 PM.

  4. #4
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    Quote Originally Posted by fietsbob View Post
    cable out of adjustment is the first thing to check, line up the 2 pitch marks ..
    If I line up the two marks, it's out of alignment and all gears skip. I have to adjust it so the mark is about 2-3mm further back. It's been that way from day one.

  5. #5
    Senior member Dan Burkhart's Avatar
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    Gears 5 thru 8 are attained when the clutch engages the planet carrier and by passes the low range reduction gear. Best bet is the clutch is not fully engaging, possibly due to a weak spring, or more likely the tabs are hanging up in the shift spring mechanism.
    You need to find somebody that has the tools and know how to disassemble it that far.
    Gearhubs demystified and other cool stuff.


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  6. #6
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    Quote Originally Posted by Dan Burkhart View Post
    Gears 5 thru 8 are attained when the clutch engages the planet carrier and by passes the low range reduction gear. Best bet is the clutch is not fully engaging, possibly due to a weak spring, or more likely the tabs are hanging up in the shift spring mechanism.
    You need to find somebody that has the tools and know how to disassemble it that far.
    I was hoping it was a simpler problem.

    I have the tools and have taken the inter-3, inter-7, and inter-8 apart many times before (and yes, got them back together and working without mysterious "spare parts"). Figured I'd ask as even though I know a lot about these hubs, I do not know everything. I'll have a look tonight and see if I can spot a problem once it's out of the shell. That part is at least simple to do.

  7. #7
    Senior member Dan Burkhart's Avatar
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    Quote Originally Posted by harshbarj View Post
    I was hoping it was a simpler problem.

    I have the tools and have taken the inter-3, inter-7, and inter-8 apart many times before (and yes, got them back together and working without mysterious "spare parts"). Figured I'd ask as even though I know a lot about these hubs, I do not know everything. I'll have a look tonight and see if I can spot a problem once it's out of the shell. That part is at least simple to do.
    At the very least, you will have to remove the carrier from the axle to see anything. By attaching the cassette joint and working the shifter, you should see the clutch snap forward when you shift to the fifth gear position. If it appears to hang up, you will likely have to remove the driver to sort it out. This requires special tools as you must know if you have fiddled around with these before.
    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.

  8. #8
    Senior Member Wilfred Laurier's Avatar
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    sounds like something wrong
    at the cassette joint it should
    line up perfectly

    but dan burkhart you
    have more experience so
    i think you're right too

  9. #9
    Senior Member vredstein's Avatar
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    Quote Originally Posted by harshbarj View Post
    I was hoping it was a simpler problem.

    I have the tools and have taken the inter-3, inter-7, and inter-8 apart many times before (and yes, got them back together and working without mysterious "spare parts"). Figured I'd ask as even though I know a lot about these hubs, I do not know everything. I'll have a look tonight and see if I can spot a problem once it's out of the shell. That part is at least simple to do.
    Taking it apart and partially re-assembling it onto the bike as shown in Dan's video https://www.youtube.com/watch?v=x_Gn...GZxhd1WdyVTi-h really helped me track down an engagement problem. It might help solve your problem.
    "See, it's not that getting wet is a big deal. Really, it's what you're getting wet with.
    Fenders....because it's probably urine."
    Bike Snob NYC

  10. #10
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    The drive side cone nut was loose. Tightened it down and then tightened the lock nut. Did not have to adjust a thing. Works great again. Did my shopping rounds and not one skip (about 15 miles total). I'll not worry about the yellow marks not lining up as it works fine again. Wish all problems were this simple. I was worried it was something internal.

  11. #11
    afraid of whales Mr IGH's Avatar
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    Quote Originally Posted by harshbarj View Post
    ...I'll not worry about the yellow marks not lining up as it works fine again....
    Are you sure you have eight gears? If it's off by that much and shifts fine, it's been my experience it's off by one gear and 1st or 8th isn't available.
    IGH's, Dyno Hubs, LED lights and old frames

  12. #12
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    Quote Originally Posted by Mr IGH View Post
    Are you sure you have eight gears? If it's off by that much and shifts fine, it's been my experience it's off by one gear and 1st or 8th isn't available.
    so OP was happy but had it wrong, then became unhappy, fixed it, and was happy again, now you're telling him he had it wrong all along and should never have been happy in the first place. have i got it right?

  13. #13
    Senior Member Wilfred Laurier's Avatar
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    Quote Originally Posted by hueyhoolihan View Post
    so OP was happy but had it wrong, then became unhappy, fixed it, and was happy again, now you're telling him he had it wrong all along and should never have been happy in the first place. have i got it right?
    better to ask that
    than to suggest tearing it
    apart for no reason

  14. #14
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    Quote Originally Posted by Mr IGH View Post
    Are you sure you have eight gears? If it's off by that much and shifts fine, it's been my experience it's off by one gear and 1st or 8th isn't available.
    All 8 gears, yes. I actually have checked to ensue I am getting all 8 as I to am a bit concerned by how much the mark needs to be off. But as long as it works and gets me around town, thats all I really care. I may just have a misaligned hub, and I can live with that. Shifting is smooth and trouble free.

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