Gear Ratio Speed
speed = (RPM / ratio) × πD / 60
Gearbox × final drive
Instructions
Enter engine RPM, overall gear ratio (gear × final drive), and tire diameter. The calculator outputs linear speed.
Formula
v = (RPM/ratio) × πD / 60
Common Questions
What if I have tire width/aspect/rim?
Convert to effective diameter using manufacturer data or compute rolling circumference; enter the diameter here.