Originally Posted by veganbikes

I get that but they also need bigger brakes and with todays dynamo technology you could charge them with minimal drag and weight. Looking at Di2 which has been around a while it requires pretty minimal charging, I remember the reports of people doing RAAM with no charging at all. Surely with brakes they could take a more minimal battery drain. However I am no expert and still would want back ups to the system at least for a little while but it is the future at some point.