Scotty.....whilst I appreciate that there is a well presented argument as to what is the nominal power rating of all these motors, it is a fact that all companies that have put their bikes through the EN15194 test have a certificate that says the rating of the motor is 250 watts,that makes these bikes legal on UK roads and customers can use these bikes without worry about prosecution. What I find arrogant is that there are some companies in the UK who blatantly advertise their bikes as 300watt or 350watt,the description of the cycles clearly suggests that such power is considered a selling point of the bicycle but they don't seem to care that these bikes are UK illegal. Contributors and viewers of this forum are well advised that these bikes are illegal so if they choose to purchase and use such a bike, they as a intelligent adult have made their own judgement as to the social responsibility and risks of prosecution of using such bikes but based upon good knowledge. However not everyone who buys these bikes reads forums such as this,they make the purchase in trust that a responsible retailer,especially one selling bikes of such high pedigree,would ever sell them a bike that is UK illegal. I suspect that most of them would be shocked to latterly realise that they could be prosecuted for using the bike on UK roads and may not realise same until an accident or police check made them aware,e-bikes are still rare on UK roads so this power limit is not well publicised,the degree of the arrogance is endorsed that these bike often have the motor power clearly visible.
Whilst I personally don't approve of the high power bikes that are openly stated on this forum at least you use illegal bikes with the knowledge of the risks that you are accepting.
As a bike designer I find it frustrating that I am designing bikes within the 250 watt limit,it would be so easy to directly replace the Suzhou Bafang 250 watt motor with the 350 watt motor but that is cheating and illegal and for me not an option.
Dave
KudosCycles