Gear Ratio Calculator provides free estimation tools for educational purposes.
Estimates, not guarantees
Every result is an estimate. Real-world outcomes depend on factors we cannot fully model: tire deflection, drivetrain losses, belt slip, air density, and more.
Not professional advice
Nothing here is professional mechanical or engineering advice. Before modifying a vehicle, consult a qualified mechanic. Incorrect modifications can affect safety, drivability, and warranty coverage.
Verify before you buy
“Buyable gear set” suggestions are research starting points, not purchase recommendations. Confirm part numbers and fitment for your specific vehicle before ordering.