We're using CIMple boxes, so that's 12 tooth pinion gears on CIMs going to a 56 tooth output gear which runs a 15 tooth double sprocket, going to "x" tooth sprockets on the wheels, where "x" currently is 22 or 24.

We can't change the gearbox itself, so we either need a larger double sprocket to mount on the CIMple box output shaft, or smaller sprockets to go on the 4" AM plaction wheels.