Some time ago, I went to the GoSwissDrive web page. Their data indicated that the 200W motor had a 42 kmh (26.2 mph) cutoff, whereas the 250W and 500W motors has a 45 kmh cutoff. It is possible to nudge 45 kmh (28 mph) by playing with wheel diameter in the diagnostics, but to no great benefit. You can set wheel diameter to the minimum of 2000 mm yourself if you have the upgraded bluetooth battery by using Mission Control. This fools the system into thinking you are going slower than you really are.