Tool category

Automotive tools

Calculators for wheel and tyre fitment, gearing and vehicle performance.

13 tools

Available calculators

Compare wheel widths, offsets and spacer effects.

Compare tyre diameter, sidewall and speedometer change.

Relate road speed, engine RPM and drivetrain ratios.

Calculate hp, PS and kW per tonne or reverse a target ratio.

Calculate engine capacity from bore, stroke and cylinder count.

Convert UK MPG, US MPG, L/100 km and km/L.

Calculate static compression ratio from detailed engine geometry.

Calculate mean piston speed from engine stroke and RPM.

Calculate hydraulic and effective brake-caliper piston area.

Estimate theoretical front and rear brake torque distribution.

Estimate supported horsepower or required fuel-injector flow.

Classify engine geometry from cylinder bore and crankshaft stroke.

Calculate oil quantity for two-stroke and other fuel mixtures.

Check physical fitment, rolling diameter and the resulting road-speed or RPM change.

Move from engine geometry to operating speed and fuel-system requirements.

Estimate mixture or injector requirements, then compare hydraulic brake area and balance.