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  1. #1
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    3/32 chain and cog 1/8 crank?

    i went and got a 17t cog yesterday but they only had 3/32 and so the lbs dude was like you can run a 3/32 cog and buy a 3/32 chain and you will be fine even though the crank is 1/8. he said it will work fine as long as i dont use a smaller chain.

    has anyone else ever ran different sized drivetrain parts? how did it work out?

    is this legit? like is it gonna some how kill on me? i saw this dudes post and he said he had wrong cog and it broke and he got messed up.

  2. #2
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    LBS dude fail.

    3/32 chain will not work if your chainring is 1/8. But your chainring might actually be 3/32 inwhich case you're OK.

  3. #3
    Team Beer Cynikal's Avatar
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    Your LBS is wrong. Go back and have him show you how to use a 3/32nd chain on a 1/8 chainring.

    Your can run 1/8th chain on the 3/32 cogs and chainrings if you need to but not the other way around.
    I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC

  4. #4
    Live without dead time
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    Quote Originally Posted by i saved latin View Post
    i went and got a 17t cog yesterday but they only had 3/32 and so the lbs dude was like you can run a 3/32 cog and buy a 3/32 chain and you will be fine even though the crank is 1/8. he said it will work fine as long as i dont use a smaller chain.

    has anyone else ever ran different sized drivetrain parts? how did it work out?

    is this legit? like is it gonna some how kill on me? i saw this dudes post and he said he had wrong cog and it broke and he got messed up.
    Considering 3/32 is smaller than 1/8...

  5. #5
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    maybe i got it it confused. he put it all on.

    okay i just checked the box and i got a 1/8" chain and cog and i got a 3/32 crank.
    the crank is the stock crank on the kilo tt.
    now that thats cleared up and i have a 1/8 chain and cog and a 3/32 crank will i be okay?
    and will it still work correctly? or is there anything i should look out for?

  6. #6
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    thank you so much.
    im sorry i got the numbers switched around.
    after reading about that one dudes cog failing i got paranoid.
    plus its always nice to hear other opinions on situations

  7. #7
    No plan. peabodypride's Avatar
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    free thread!

  8. #8
    takin' it to the streets malpag3's Avatar
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    Yeah, fail.

    I run a 1/8" chain and cog that works just fine with a 3/32" chainring.
    "Any Movement That Forgets About Class Is a Bowel Movement" ~ 1-speed bike (AKA Bottleskup Flenkenkenmike AKA Aidan Girt)

  9. #9
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    Quote Originally Posted by malpag3 View Post
    Yeah, fail.

    I run a 1/8" chain and cog that works just fine with a 3/32" chainring.
    I run a 3/32 chain with a 1/8 42t front and a 3/32 Dingleberry rear.

    3/32 vs 4/32 isn't really a significant change in width. I think that a 3/32 5/7/8 speed chain would work ok, but a 9/10/11 might not.
    Last edited by clink83; 10-17-08 at 03:48 PM.

  10. #10
    cab horn
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    Quote Originally Posted by clink83 View Post
    I run a 3/32 chain with a 1/8 42t front and a 3/32 Dingleberry rear.
    .
    No, you don't.

    There is NO WAY a 3/32 chain will work on ANY 1/8 chainring or cog.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  11. #11
    cab horn
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    Quote Originally Posted by clink83 View Post
    3/32 vs 4/32 isn't really a significant change in width. I think that a 3/32 5/7/8 speed chain would work ok, but a 9/10/11 might not.
    Wrong again. All 3/32 derailleur chains, those marked 7,8,9,10 speed will work with 3/32 cogs/chainrings. The inner diameter, where it actually matters does not change as you go up in speed. Only the outside.
    Mes compaingnons cui j'amoie et cui j'aim,... Me di, chanson.

  12. #12
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    Quote Originally Posted by operator View Post
    Wrong again. All 3/32 derailleur chains, those marked 7,8,9,10 speed will work with 3/32 cogs/chainrings. The inner diameter, where it actually matters does not change as you go up in speed. Only the outside.
    Well, my bike came with a 1/8in chain, 1/8 freewheel and chainring, and all I did was switch out the rims and put on a 3/32 chain and cog. It worked fine, aside from making a small amount of noise. I checked the chain when I removed it and it had very little sign of any wear. Now, it is possible like someone else said above that it came stock with a 3/32 ring and 1/8in chain, in which case I'm mistaken.

    What I was saying about the 3/32 chain is you can probably get away with running 3/32 chain made for old 5/6 speeds since they would have less prescise tolerances vs the newer 8/9/10 speed indexed stuff thats going to have closer tolerances due to indexed shifting. Thats what I did at least.
    Last edited by clink83; 10-20-08 at 10:05 AM.

  13. #13
    Team Smartass middy's Avatar
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    Quote Originally Posted by clink83 View Post
    Well, my bike came with a 1/8in chain, 1/8 freewheel and chainring, and all I did was switch out the rims and put on a 3/32 chain and cog. It worked fine, aside from making a small amount of noise. I checked the chain when I removed it and it had very little sign of any wear.

    What I was saying about the 3/32 chain is you can probably get away with running 3/32 chain made for old 5/6 speeds since they would have less prescise tolerances vs the newer 8/9/10 speed indexed stuff thats going to have closer tolerances due to indexed shifting. Thats what I did at least.
    Your chainring is 3/32.

  14. #14
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    In which case ignore what I just said

  15. #15
    666 triplesixer's Avatar
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    Your bike will make terrible noise if you use 1/8 chain and anything else 3/32.
    w w w . t a r c k b i k e . c o m

  16. #16
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    Where are you from? Yesterday i bought a 17t cog and they gave me a 1/8th when i needed a 3/32. I got to go back to santa cruz to exchange it. Wanna trade if you live nearby? Im from San Jose, CA

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