An update on our Cytronex C1 installation: after about 3500 miles and 146 discharge/charges:
the wheel hasn’t collapsed, the fork and dropouts haven’t bent and the C1 works like a charm. Installation takes about 30 minutes.
Handling is not affected and power comes in gradually, so there is no loss of control on starting. Power is 250W.
I cannot imagine having to deal with a 750W motor in the front wheel, aside from the weight of that plus a battery.
Of course it depends upon intended use, but for 30 mile rides, even at 17-18 mph, the C1 is ideal for our combined ages of 161!
The C1 adds about 8lb, so the tandem is easy to stick in the back of our car once the front wheel is removed, which is very easy.
After sales support and remote diagnostics from the UK are outstanding.
Just a note about Li-ion batteries: make sure you don’t frequently discharge completely as we have been doing, which has resulted in a decrease in capacity to about 80% of what it was when new.