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  1. #1
    mtbr member
    Reputation: DiRt DeViL's Avatar
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    New question here. Chain/Cog/Half-Link question

    I just installed a new SRAM PC99 chain with the Spicer Half-Link and I have 2 problems.

    1) The chain and cog aren't engaging correctly.





    2) The chain tension is about the same as it was without the half-link.

    The cog is also new, the only used part is the chainring and there's no problem in that area.

    Any ideas?

    I already emailed Gene @ Spicer Cycles for his opinion.



  2. #2
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    Reputation: _K9_'s Avatar
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    some questions

    I don't see the half-link in the pictures (am I wrong?) , so it doesn't look like it's causing the engagement problems... some questions come to mind...

    Does the problem occur at the same tooth on the cog? Does it occur at the same link in the chain? Can you push the chain down over the cog or does it not physically fit?

    I rode a half-link a while back (different manufacturer) and didn't have these problems.

    Kevin

  3. #3
    mtbr member
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    The half-link doesn't seem to be the problem.

    I can push the chain down with minimal force but haven't tried to see if it's the tooth or link.

  4. #4
    Cracker-magnon
    Reputation: gpsser's Avatar
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    Quote Originally Posted by DiRt DeViL
    The half-link doesn't seem to be the problem.

    I can push the chain down with minimal force but haven't tried to see if it's the tooth or link.
    Is it a 9 speed chain, and a bmx type cog?? if so it (the chain) may be just a tad to narrow for the cog. You may want to try a 7/8sp chain, and see if that helps.
    [SIZE=2]"Life is a F@#^ing story problem, get used to it - my son.[/SIZE]

  5. #5
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    You may be on to something but I was using a worned out similar chain.

    Could the chain be the issue?

  6. #6
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    yes...

    Quote Originally Posted by DiRt DeViL
    Could the chain be the issue?
    I think so. I would try an 8 speed chain if you have one. Or go buy a cheap bmx chain (1/8 inch) for $8 and give that a shot.

    [edit]
    should mention that your chain width should probably match the width of the half link. So if it's a 1/8 half link, use a 1/8 chain. If it's a 3/32 half link go for an 7/8 speed chain. At least I think that's how it works.....
    [/edit]

    Kevin

  7. #7
    USB Rep'n
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    Quote Originally Posted by _K9_
    I think so. I would try an 8 speed chain if you have one. Or go buy a cheap bmx chain (1/8 inch) for $8 and give that a shot.

    [edit]
    should mention that your chain width should probably match the width of the half link. So if it's a 1/8 half link, use a 1/8 chain. If it's a 3/32 half link go for an 7/8 speed chain. At least I think that's how it works.....
    [/edit]

    Kevin

    yup, you got it right. I would not be shocked at all at that except I don't think he'd be able to connect a 3/32" cahin with a 1/8" half link so the link is not the issue for sure. I have to believe that the cog and the chain are different widths, most likely a 9 spd (or 8 spd) chain and a bmx 1/8" cog. that would do it. the only other thing that wasn't mentioned was if there were chainline adjustments made when things were changed out. that could also be the culprit.
    though hope is frail, it must prevail - Taj Weekes

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  8. #8
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    Ordered new cog

    The problem seems to be chain (9spd) / cog (BMX 1/8") incompatibility. I got a cog set from Fast Freddy on the way, hopefully that will be the end of my problem.

    Thank you all for your helpfull comments.

  9. #9
    USB Rep'n
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    Quote Originally Posted by DiRt DeViL
    I got a cog set from Fast Freddy on the way, hopefully that will be the end of my problem.
    oh man.....you're problems are just about to begin then!!!
    though hope is frail, it must prevail - Taj Weekes

    betam eh-wud-eh-HA-lehu y
    eh-nay Ityopia!

  10. #10
    Speedhub doc.
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    "chain line"?

    Is the chain line bang on? Also, using either a new chain / worn cogs or worn chain / new cogs/ring could be the fault. A new chain will not sit down into the cogs toth profile as the old chain/cog wear together. Maybe, a couple of the cogs teeth are "bent or twisted" (hooked) causing the chain jump issue..


    "UP the IRONS"!

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