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  1. #1
    TreadHead MtbVA's Avatar
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    If 46x18 works without tensioner what else will?

    If a 46 front & 18 rear works without a tensioner how many teeth at a time can I drop and still not need a tensioner?
    I guess I'm looking for a relationship between cog teeth & links.....such as X teeth = Y links.
    I'm converting a Klein Pulse MTB to single speed for commuter use and the 46 tooth front (stock shimano triple cranks with 26-36-46) with a conversion kit using 18 tooth rear cog has perfect chain tension, but I'd like to drop a few teeth to make it a little easier to pedal for everyday use.

  2. #2
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    im not sure but its interesting. I have a Scattante XRL single speed that had a tensioner on it but now doesn't, its perfect tension too, and i am kinda (but in not at all) wondering what else would work as well. IM sure it correlates to some many gears=so many links bla bla bla

  3. #3
    lifewaster. helloamerican's Avatar
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    you's gonna get jello legs riding an easier ratio than that.

  4. #4
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    heres a link to a program that will help you figure it out. http://www.rpcsoftware.co.uk/Cyculator/Fixed.htm

  5. #5
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    Maybe my stoned logic is faulty, but wouldn't any ratio with the same number of teeth work? If you have the same total number of teeth in two ratios, wouldn't that mean the same number of chain links are engaged at all times? Would that not mean that the chain lengths would be the same?

    For example:
    46x18=64 teeth
    45x19=64 teeth
    47x17=64 teeth
    etc.

    Is this correct?

  6. #6
    ALL PARTY ryansexton's Avatar
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    Nope. 1 tooth in your rear cog is worth 3 in the front, or at least thats what I was explained.

    The teeth might be the same, but the gear inches would be off.
    Quote Originally Posted by crushkilldstroy View Post
    This is SSFG. Nothing is logical here.

  7. #7
    jack of one or two trades Aeroplane's Avatar
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    Quote Originally Posted by deadforkinglast View Post
    Maybe my stoned logic is faulty, but wouldn't any ratio with the same number of teeth work? If you have the same total number of teeth in two ratios, wouldn't that mean the same number of chain links are engaged at all times? Would that not mean that the chain lengths would be the same?

    For example:
    46x18=64 teeth
    45x19=64 teeth
    47x17=64 teeth
    etc.

    Is this correct?
    This is the rule of thumb. Of course, there will be a little bit of variance due to the angles at which the chain comes off the chainring/cog, but it's the best thing you can do without doing some mad trigonometry.
    Quote Originally Posted by Dr Irwin Goldstein
    Men should never ride bicycles. Riding should be banned and outlawed. It is
    the most irrational form of exercise I could ever bring to discussion.

  8. #8
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    Quote Originally Posted by ryansexton View Post
    Nope. 1 tooth in your rear cog is worth 3 in the front, or at least thats what I was explained.

    The teeth might be the same, but the gear inches would be off.
    Well, of course. We're talking about changing ratios without having to move the wheel. Being able to have ratios with different gear inches is the goal here.

  9. #9
    Team Beer Cynikal's Avatar
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    Quote Originally Posted by mtnbiker4791 View Post
    heres a link to a program that will help you figure it out. http://www.rpcsoftware.co.uk/Cyculator/Fixed.htm
    Anyone get this to work? Is this a Palm utility or something?

    I'm also looking for a program that can do this. I have a MTB which 44x16 is perfect but I would like to find a dirt gearing for it without a tensioner.
    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

  10. #10
    domestique squeakywheel's Avatar
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    4 teeth = 1 link

    Adding / removing one tooth will move your axle 1/8 inch. Adding / removing one whole chain link will move your axle 1/2 inch. You can buy a half link to put in your chain to move the axle 1/4 inch. Someone makes a chain made entirely of half links.
    Clinging to my guns and religion.

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