just found those - great!Correct. The retailers cannot really give you information on de-restricting their bikes because of legal liabilities, but if you have a look on the Woosh kit and Sirocco CD review threads, there's info on how to adjust the speed limit up to 24mph or 27mph. Changing the speed limit doesn't add any power. The extra speed can only be realised downhill, with the wind behind you or when you pedal hard enough. The motor/controller combination are designed for the higher speed limit, so there shouldn't be any mechanical down-side. In fact I'm sure it's better for them than the constant cutting in and out of power at 15 mph.