Car and motorcycle tuning
Gearing, tyres, displacement and fuelling, all read off the numbers already stamped on the parts.
Gear ratios and speed
Speed in every gear at a given engine speed, with overall ratios.
OpenSpeedometer error from a tyre change
Actual speed, error and diameter change after a tyre change.
OpenDisplacement and compression ratio
Displacement and compression ratio from the engine's own dimensions.
OpenInjector sizing
Injector size for a power target, with a fuel-pressure correction.
OpenFuel consumption and running cost
l/100 km, mpg both ways, cost per kilometre and tank range.
OpenTyre size comparison
Diameters, sidewalls and revolutions for two tyre sizes compared.
OpenThese are planning figures, not a substitute for a standard, a specification or a professional. Check anything that matters against the source your trade actually works to.