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#Post#: 14045-------------------------------------------------- |
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Determining gear Ratios |
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By: jns Date: November 8, 2025, 3:33 am |
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To determine the engine to rear wheel gear ratio, do you just |
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divide the teeth on the large driven sprocket by the teeth on |
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the drive sprocket? I am proposing to install the engine in the |
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front and use a single layshaft somewhere along the side with |
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driver and driven sprockets of different sizes. I am using this |
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arrangement for two reasons, one, to shorten the chain length |
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and two, so ratio change is made easy by changing the driving |
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sprocket on the layshaft to the rear wheel. Therefore I need to |
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make two calculations, engine to layshaft and layshaft to rear |
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wheel. Do I just add the two results together or is there more |
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to it than that? |
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#Post#: 14046-------------------------------------------------- |
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Re: Determining gear Ratios |
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By: Snakey Date: November 8, 2025, 4:25 am |
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Hi, The formula I use (found somewhere on the interweb an age |
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ago) is: |
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(driving sprocket 1 / driven sprocket 1) x (driving sprocket 2 / |
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driven sprocket 2) |
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So almost as you said, but multiply the two ratios. |
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#Post#: 14047-------------------------------------------------- |
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Re: Determining gear Ratios |
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By: Granville Date: November 8, 2025, 4:37 am |
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I used this hope it helps |
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https://www.bmikarts.com/go-kart-gear-ratio-calculator-jackshaft-setup |
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#Post#: 14048-------------------------------------------------- |
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Re: Determining gear Ratios |
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By: jns Date: November 8, 2025, 10:54 am |
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My thanks to the Baron. I have used the formula and found the |
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answer. |
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#Post#: 14049-------------------------------------------------- |
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Re: Determining gear Ratios |
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By: jns Date: November 9, 2025, 11:35 am |
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Also thanks to Snakey. Longer method but same answers |
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