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#Post#: 14045--------------------------------------------------
Determining gear Ratios
DIR 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
divide the teeth on the large driven sprocket by the teeth on
the drive sprocket? I am proposing to install the engine in the
front and use a single layshaft somewhere along the side with
driver and driven sprockets of different sizes. I am using this
arrangement for two reasons, one, to shorten the chain length
and two, so ratio change is made easy by changing the driving
sprocket on the layshaft to the rear wheel. Therefore I need to
make two calculations, engine to layshaft and layshaft to rear
wheel. Do I just add the two results together or is there more
to it than that?
#Post#: 14046--------------------------------------------------
Re: Determining gear Ratios
DIR 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
ago) is:
(driving sprocket 1 / driven sprocket 1) x (driving sprocket 2 /
driven sprocket 2)
So almost as you said, but multiply the two ratios.
#Post#: 14047--------------------------------------------------
Re: Determining gear Ratios
DIR By: Granville
Date: November 8, 2025, 4:37 am
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I used this hope it helps
HTML https://www.bmikarts.com/go-kart-gear-ratio-calculator-jackshaft-setup
#Post#: 14048--------------------------------------------------
Re: Determining gear Ratios
DIR 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
answer.
#Post#: 14049--------------------------------------------------
Re: Determining gear Ratios
DIR 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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