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here's how to calculate your gear ratios : https://www.theengineerspost.com/gear-ratio/ a simple video explaining what a gear ratio does in a car : this page has useful info too : https://interestingengineering.com/science/machine-design-101-gear-ratios

I'll try to explain then i'll link a video or article that explains it better. Basically your gear ratio is how many turns your input has to make for your output to make 1 360° turn. The more turns your input makes, the more torque. The less turns the higher top speed* Cars use gear ratios in...