My fantasy bike would allow me to ride at 68 like I could at 45. I’d be able to do a 100 mile club ride with 6000 feet of climbing at 16 mph. It would look like a normal race bike. It seems to me that such a bike does not yet exist but some bikes are close. Also I am 5’3.5” and just a tad too short for the Orbea Gain. It seems like the technology is almost there.