Calculators

Quick and free calculators for motorcycle maintenance and choosing the right gear. Results appear as soon as you enter your numbers.

2-stroke fuel mix calculator

How much 2-stroke oil to add to petrol (25:1, 50:1 etc.).

Mix two oils to get the viscosity you need.

Change the oil level in millimetres → how many ml to add or remove.

Compare two tyres – motorcycle and ATV sizes, speedometer error.

How a sprocket change affects acceleration and top speed.

Main jet correction for altitude, temperature and humidity.

Displacement from bore and stroke + effect of a big bore / overbore.

kW ↔ PS ↔ hp ↔ bhp and power from torque.

How many links your chain needs + chain sizes and types compared.

Find equivalent spark plugs from other brands for your plug code.

The right helmet size from your head circumference.