I know Gary, but with the smaller 400W motor the peak torque is 3.82Nm and with a 2.5:1 ratio, this gives me less than 10Nm peak. From the tests I've done I need around 12Nm, so I'd rather go slightly bigger and later on downgrade. Plus the price difference between the 400W and 750W is almost nothing, size-wise it might matter, so I'll have a think about it.