How much oil goes into 2-stroke fuel? How many links does a new chain need? Which NGK plug replaces a Champion code? We get questions like these every day, so we built calculators to answer them. The Starmoto calculators page now has 16 free tools that show the result as soon as you enter your numbers – on your phone too. Each calculator comes with a guide, FAQ and a direct link to matching products.
Fuel and oils
⛽ 2-stroke fuel mix calculator
How much 2-stroke oil to add to petrol (25:1, 50:1 etc.).
?️ Fuel Tank Range Calculator
How far on one tank, plus reserve and fuel cost in euros.
?️ Fork oil mixing calculator
Mix two oils to get the viscosity you need.
? Fork oil level calculator
Change the oil level in millimetres → how many ml to add or remove.
Tyres and wheels
? Tyre size calculator
Compare two tyres – motorcycle and ATV sizes, speedometer error.
Engine and drivetrain
⚙️ Gear ratio calculator
How a sprocket change affects acceleration and top speed.
? Valve shim calculator
Measured valve clearance + current shim → new shim thickness.
?️ Carburettor jetting calculator
Main jet correction for altitude, temperature and humidity.
? Engine displacement calculator
Displacement from bore and stroke + effect of a big bore / overbore.
⚡ Power converter – kW, PS, hp and bhp
kW ↔ PS ↔ hp ↔ bhp and power from torque.
? Scooter variator (CVT) simulator
Animated variator: change roller weight and springs, see the effect.
? Motorcycle chain length calculator
How many links your chain needs + chain sizes and types compared.
? Spark plug cross-reference
Find equivalent spark plugs from other brands for your plug code.
Electric vehicles
? Electric Vehicle Range Calculator
How far and how long an electric vehicle runs on one charge.
? Battery Charging Time Calculator
How long a battery takes to charge and whether the charger suits it.
Riding gear
? Helmet size calculator
The right helmet size from your head circumference.
All calculators in one place
You can find all the tools at starmoto.eu/calculators. If a calculator is missing or you have a question, write to us – we keep adding new tools.
Let's ride together! ?
