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  1. #1
    Large wheels & one gear
    Reputation: Konapdlr's Avatar
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    Ruined rear cog....again

    OK, this sucks! A few months ago I wore out my rear cog (King stainless), put a new Niner (Aluminum) cog on. Have only 100 miles or so on it, ruined! Has a few teeth with the same wear pattern that the King had. The only thing I can think of is maybe my chainline is off. When I put the new cog on I also put on a new chain. So It wasn't from a worn chain. So what's the deal? Any ideas/suggestions? Got another Niner cog on the way and don't really feel like feeding this bike new cogs every couple months.
    I Never Apologize............I'm Sorry, That's Just The Way I Am.

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  2. #2
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    Reputation: ionsmuse's Avatar
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    Mo' info, please.

    So only a few teeth in one place on each cog are messed up/ worn? Chainline would seem to give an asymmetric, "off side" wear pattern. Only other thing I can think of is maybe your chain's too tight, and the un-concentricity on either cog of chainring is causing wear at a tight spot.

  3. #3
    Medium?
    Reputation: Fast Eddy's Avatar
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    Quote Originally Posted by Konapdlr
    OK, this sucks! A few months ago I wore out my rear cog (King stainless), put a new Niner (Aluminum) cog on. Have only 100 miles or so on it, ruined!
    Stainless is soft, alu is softer. Get a steel cog. I'll bet you're not a lightweight with weak legs.

    http://cgi.ebay.com/Surly-Single-Spe...QQcmdZViewItem

    I've got a couple thousand miles on an ENO freewheel.

    Larger cogs wear more slowly.

  4. #4
    mtbr member
    Reputation: kendogg's Avatar
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    Definately get a steel cog. I borrowed an aluminum King cog last year, broke it on the first ride. I don't think Al is good for the kind of torque generated by SS. Especially when trying to use too tall of a gear up steep climbs.

  5. #5
    my knees hurt
    Reputation: singlespeedsycip's Avatar
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    Definetely check your chainline...if its off it will cause premature wear. What size cog are you running in the rear? I have a few boone ti cogs you can give a try to see how they hold up.....
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  6. #6
    Ride 'Til Your Knees Hurt
    Reputation: cycljunkie's Avatar
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    Standard hub (w/cassette body)? Could the cass. body be out of alignment somehow? This might cause the cog rotation to be skew-whiff. Just a thought...
    Can you hear me now?

  7. #7
    Medium?
    Reputation: Fast Eddy's Avatar
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    Quote Originally Posted by singlespeedsycip
    Definetely check your chainline...if its off it will cause premature wear. What size cog are you running in the rear? I have a few boone ti cogs you can give a try to see how they hold up.....
    Not necessarily.

    My setup would have the front ring in the big ring position, on the outside, for proper chainline. Instead, I've got a bash ring and the front ring is in the middle ring position. When it's really dry it's a bit noisy, but like I said, I've got thousands of miles on an ENO freewheel, and it's still going.

    Chains are meant to allow some shift and even a bmx chain can work with a little bit.

    You know who made my Phil Wood, right?

  8. #8
    Ouch, I am hot!
    Reputation: Dirdir's Avatar
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    Quote Originally Posted by Fast Eddy
    Not necessarily.

    My setup would have the front ring in the big ring position, on the outside, for proper chainline. Instead, I've got a bash ring and the front ring is in the middle ring position. When it's really dry it's a bit noisy, but like I said, I've got thousands of miles on an ENO freewheel, and it's still going.

    Chains are meant to allow some shift and even a bmx chain can work with a little bit.

    You know who made my Phil Wood, right?
    I think you should try a Surly (steel) or Boone cog. My chainline is "eye alligned" and I have not seen any wear on my Boone. I know the chainline is not perfect.
    I AM JUST A JERK

  9. #9
    sprocket
    Reputation: yetisurly's Avatar
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    Quote Originally Posted by Konapdlr
    OK, this sucks! A few months ago I wore out my rear cog (King stainless), put a new Niner (Aluminum) cog on. Have only 100 miles or so on it, ruined! Has a few teeth with the same wear pattern that the King had. The only thing I can think of is maybe my chainline is off. When I put the new cog on I also put on a new chain. So It wasn't from a worn chain. So what's the deal? Any ideas/suggestions? Got another Niner cog on the way and don't really feel like feeding this bike new cogs every couple months.

    what gear combination are you running?

  10. #10
    Large wheels & one gear
    Reputation: Konapdlr's Avatar
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    I am running 32:20 on the Kona and 32:19 on the Haro. The rear hub is a Hope Bulb (about a year old). I am beginning to think that the chain may have been to tight. I have had issues with the rear end loosening up and I cranked it down recently and the chain seemed a little tighter than I would have liked but, thought it would be ok. I don't know.....I hope that's the problem.

    I have a Surly (19t) on my Haro that I am going to switch over and run. This way I can see if an aluminum cogs are really that weak.

    Thanks for the offer on the Boone cog Mark. If I took you up on it. First, I would feel bad if I damaged it. Second, I would be out even more money. Third I would totally dig the blingness and you would never get it back.
    I Never Apologize............I'm Sorry, That's Just The Way I Am.

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  11. #11
    NardoSS
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    Quote Originally Posted by Dirdir
    I think you should try a Surly (steel) or Boone cog. My chainline is "eye alligned" and I have not seen any wear on my Boone. I know the chainline is not perfect.
    I've been running a Boone for about 250-ish miles and it looks brand spankin' new. Keep in mind that I don't ride really hard.

    Careful when you buy from oneunoone or 1-uno-1 on ebay because he sent me factory second that I had to have warrantied as soon as it arrived. Freakin waste of time. The one negative feedback he has is from me.

  12. #12
    I lean like a cholo!
    Reputation: Evil Con-fecal's Avatar
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    How's your chain?

    How's your chain? Is it stretched? Are the rollers "spooled"? Seems to me that over tensioning and or a bad chain would kill a cog faster than anything. If you've been over tensioning than your chain is probably stretched too. Change your chain like your oil, once every 3 months or as needed with hard riding/driving.
    ...and I used my strength to rip my blouse...

  13. #13
    Over the Hill
    Reputation: dstepper's Avatar
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    I only got about 3 months out of my White Industries Aluminum front chainring. Way to soft, I flattened out the teeth making them hook like. The metal was still there it was just deformed and flattened.

    18 months later and I can not see any wear on any of my Boone parts.

    Dean

  14. #14
    Large wheels & one gear
    Reputation: Konapdlr's Avatar
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    Quote Originally Posted by dstepper
    I only got about 3 months out of my White Industries Aluminum front chainring. Way to soft, I flattened out the teeth making them hook like. The metal was still there it was just deformed and flattened.

    18 months later and I can not see any wear on any of my Boone parts.

    Dean
    I am also running a WI Aluminum front cog. I just replaced it along with my worn out King rear cog a couple months ago. This Niner cog only lasted a couple months. Pretty sure now that it is from me having the chain to tight. The chain was new. Now I have another new one on with a Surly cog. Hopefully it will work out better. If not, I am going to put Boone on front and rear.
    I Never Apologize............I'm Sorry, That's Just The Way I Am.

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  15. #15
    A plethora of pinatas
    Reputation: mcoplea's Avatar
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    Speaking of chain tension, how tight do you all set yours? I am using a ENO hub as well on my SS and not sure how tight is too tight or too loose. Thx!
    Marty

  16. #16
    Ouch, I am hot!
    Reputation: Dirdir's Avatar
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    Quote Originally Posted by mcoplea
    Speaking of chain tension, how tight do you all set yours? I am using a ENO hub as well on my SS and not sure how tight is too tight or too loose. Thx!
    Too tight = it binds
    Too loose = it falls off
    I AM JUST A JERK

  17. #17
    A plethora of pinatas
    Reputation: mcoplea's Avatar
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    Quote Originally Posted by Dirdir
    Too tight = it binds
    Too loose = it falls off
    Sounds simple enough. Thx!!
    Marty

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