RS Pro Model Motors have an offset multi-ratio plastic gearbox fitted
They are available in two formats, either assembled or unassembled
The assembled is supplied in a final ratio of 4096：1
The unassembled are supplied with 4：1 ratio pinion gears which can be assembled to produce ratios from 4：1 to 4096：1, depending on how many gears are fitted
The final output speed is determined by the motor supply voltage
