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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 06-08-08, 05:16 PM   #1
MtbVA
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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.
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Old 06-08-08, 05:23 PM   #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
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Old 06-08-08, 06:39 PM   #3
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you's gonna get jello legs riding an easier ratio than that.
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Old 06-08-08, 08:22 PM   #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
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Old 06-09-08, 02:42 AM   #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?
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Old 06-09-08, 05:45 AM   #6
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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.
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Old 06-09-08, 06:21 AM   #7
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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.
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Old 06-09-08, 12:49 PM   #8
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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.
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.
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Old 06-09-08, 01:26 PM   #9
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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.
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Old 06-09-08, 01:57 PM   #10
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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.
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