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Tool category
Automotive tools
Calculators for wheel and tyre fitment, gearing and vehicle performance.
8 tools
Available calculators
Wheel Fitment Calculator
Compare wheel widths, offsets and spacer effects.
Tyre Size Calculator
Compare tyre diameter, sidewall and speedometer change.
Gear Ratio / RPM Calculator
Relate road speed, engine RPM and drivetrain ratios.
Power-to-Weight Calculator
Calculate hp, PS and kW per tonne or reverse a target ratio.
Engine Displacement Calculator
Calculate engine capacity from bore, stroke and cylinder count.
Fuel Economy Converter
Convert UK MPG, US MPG, L/100 km and km/L.
Compression Ratio Calculator
Calculate static compression ratio from detailed engine geometry.
Mean Piston Speed Calculator
Calculate mean piston speed from engine stroke and RPM.