Latest posts
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How to Find Your Gear Ratio Without Pulling the Cover
Wondering how to find gear ratio without pulling the diff cover? You don’t need to drain the diff and count teeth to learn your axle ratio. Between the factory tags, option codes, and a two-minute rotation test with a floor jack, you can pin down your gear ratio with the cover still on — here’s…
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Gear Ratio Chart: Engine RPM by Tire Size and Axle Ratio
This gear ratio chart shows engine RPM at 65 mph for common axle ratios and tire diameters, assuming a 1:1 top gear (direct drive). Find your tire size down the left, read across to your gear ratio, and you’ll see exactly where your engine sits at highway speed — and what a re-gear or a…
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How to Work Out Gear Ratio
If you want to know how to work out gear ratio, start with one question: how many times does the input turn for one turn of the output? Whether it’s a bicycle sprocket set, a motorcycle final drive, or the diff in a pickup, answer that — by counting teeth, measuring sprockets, or counting rotations…
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How to Calculate Gear Ratio
How to calculate gear ratio is simpler than the jargon suggests: it is a single division. If you can count teeth (or read them off a spec sheet), you can calculate any gear ratio in seconds. This guide covers every method — teeth, diameter, and RPM — with worked examples for cars, gearboxes, and multi-stage…