Though I’m not a fan of the petrol assisted bicycle I have to admire the engineering of some, like this one that I often see around Belmont. It has had a lot of time and expense put in by the owner. The rear hub is a Nexus 8, and the engine and pedals share the same final drive. Also there are some neat accessories, as you can see.
My biggest worry about these bikes is their noise, and hence the unwanted attention that they may draw from anti-cyclists and legislators. Nevertheless, this bike looks amazing.