What is ATV overall drive ratio?
Overall drive ratio is the transmission ratio multiplied by the final-drive or sprocket ratio. A higher number means more torque multiplication and usually a lower speed at the same RPM.
ATV Calculator
ATV Gear Ratio Calculator
Use this gear ratio calculator to combine transmission and final-drive numbers, then see how that overall ratio changes estimated road speed at a given RPM and tire size.
Results
Values update after you calculate. Empty or invalid inputs will not invent a number.
Enter the values and choose Calculate to see estimates.
How it works
Enter engine RPM, tire diameter, the selected transmission ratio, and final drive. The calculator multiplies those ratios into one overall drive ratio, then converts RPM and tire diameter into estimated miles per hour.
Overall ratio = transmission ratio × final drive. Estimated mph = (RPM × tire diameter in inches) ÷ (overall ratio × 336).
These results are estimates for planning only. They are not OEM specifications, safety certifications, or professional mechanical, legal, or financial advice.
Gear Ratio Calculator FAQs
Does tire size change the gear-ratio result?
The ratio itself does not change when you swap tires, but estimated speed does. Taller tires cover more ground per revolution, so the same gearing shows a higher speed.
Can I use sprocket teeth instead of final drive?
Yes. Divide rear sprocket teeth by front sprocket teeth to get a final-drive number, then enter that value here.
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