In reply to Rog Wilko:
No I don't, but if you are looking for some e support for a normal bike, the Austrian Vivax assist system is the way to go. No special downtube or bottom bracket required, can be fitted to most bikes with standard diameter seat tubes.
https://www.vivax-assist.com/de/produkte/vivax-assist-4-0/vivax-assist_4-0....
Sorry, website seems to be in German only,
CB
