OD of 40 and 42 tooth cinch chainring?- Mtbr.com
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  1. #1
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    OD of 40 and 42 tooth cinch chainring?

    I am looking to fit a 40 or 42 tooth chainring to a fat bike in a sort of Monster-cross fatty build. looking to get more of a road suitable gearing option. I am currently running a Turbine cinch crank with 32T and it has lots of room to spare before contacting the chain stay. I am trying to get the biggest chainring possible with out buying a few and having to sell the ones i don't need. So if anyone could measure the OD of their 40T or 42T chainring that would be awesome.

    thanks in advance.

  2. #2
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    Quote Originally Posted by Jefflinde View Post
    I am looking to fit a 40 or 42 tooth chainring to a fat bike in a sort of Monster-cross fatty build. looking to get more of a road suitable gearing option. I am currently running a Turbine cinch crank with 32T and it has lots of room to spare before contacting the chain stay. I am trying to get the biggest chainring possible with out buying a few and having to sell the ones i don't need. So if anyone could measure the OD of their 40T or 42T chainring that would be awesome.

    thanks in advance.
    40t sram is 6-5/8"
    42t absolute black 6-7/8"
    Fatbike, XC bike, Gravel Bike....

  3. #3
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    Perfect. Thank you so much

  4. #4
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    if you have a Cassette cluster with a 42 tooth cog on it
    you can always measure that.

    a 42tooth cog is just about the same size as a 42tooth chainring.

  5. #5
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    Pretty simple math if you're into that. Teeth are spaced at half inch intervals to line up with our links. So a 40t ring had a circumference of 20". C = Pi x D or 6.37" in diameter.

  6. #6
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    The biggest cog i have is a 38 and i figured there was a math trick but didn't know what it was. thanks again everyone for your help.

  7. #7
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    Quote Originally Posted by Shinkers View Post
    Pretty simple math if you're into that. Teeth are spaced at half inch intervals to line up with our links. So a 40t ring had a circumference of 20". C = Pi x D or 6.37" in diameter.
    Except the measured diameter above is 6.625". I suspect because the teeth stick out farther than the midline of the chain.
    Latitude 61

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