Motorcycle Top Speed Calculator
Enter your gear ratios, sprocket sizes, tyre dimensions, and redline RPM to calculate theoretical top speed in every gear.
Find Your Bike
Gearbox Setup
⚠️ Gear ratios are not available from manufacturer specs — enter yours from a workshop manual or service data.
Final Drive & Tyre
Engine
How Top Speed Is Calculated
Theoretical top speed depends on four factors: engine redline, gear ratios, final drive ratio (sprocket sizes), and tyre rolling circumference. At a given RPM in a given gear, the wheel rotates at RPM divided by the combined gear and drive ratios. Multiply by tyre circumference and you get ground speed.
Why Results Differ From Real-World Top Speed
This calculator shows the theoretical maximum if the engine reaches redline in every gear simultaneously. Real-world speed is limited by aerodynamic drag (which increases with the square of velocity), available power at the wheel, and rider position. Most bikes hit their aerodynamic ceiling in 5th or 6th gear well before redline.
Using the BikeFinder Lookup
When you search for a bike, the tool pre-fills gear count, rear tyre dimensions, and primary drive ratio where available from the manufacturer specification database. You can then fine-tune any value before calculating.