Working out gear ratios.- Mtbr.com
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  1. #1
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    Working out gear ratios.

    Hey guys So I have a 26" dirt jumper which is basically a bmx setup.and I can't figure out the gearing and don't want to waste money on trying multiple setups. So on my bmx I have 28t sprocket and a 9t driver and on the dirt jumper it's a 27t Sprocket with 9t driver. It was 27-12 but it was too easy and now it's too hard Just wondering if anybody knew a formula to calculate 26" to 20"?

  2. #2
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    You need a gear-inch calculator...

    BikeCalc.com - Bicycle Gear Inches Chart
    Salsa Timberjack SS
    -Gears give me headaches

  3. #3
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    Oh thank you. This is what I couldn't find. According to this calculator I'll. Need a 21t sprocket on the front. That's pretty small. And will be difficult to find aha.

  4. #4
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    You may need to go with a larger cog, so you can run a larger chainring upfront. Easier on the drivetrain bits as well...
    Salsa Timberjack SS
    -Gears give me headaches

  5. #5
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    I think if I went a 11t driver on the rear it should be pretty close.

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