I needed to transport my bike today so it was the perfect opportunity go to do a fit test of the bike in the Tesla Model S. I prepared for the first test by folding down both of the back seats and laying down a pet covering across the entire surface. The covering will minimize abrasion and potential damage to the carpet lined seat backs. I loaded the bike into the rear hatch and found everything to fit really nicely.
I decided that it would be easier to load the bike if the rear wheels were to face inwards (towards the front of the car). It was much easier to maneuver and adjust the bike when the steering assembly was facing towards me. Just don’t forget to always keep the chain side up.
While someone could potentially sit in the rear seat, its not going to be very comfortable, nor safe, considering a portion of the bike encroaches into the passenger’s territory. And for that reason I don’t think this would be a viable technique for stowing a bike.
Also see: Full Size Folding Electric Bike in a Tesla Model S
In the end, the Tesla Model S is more than capable of carrying a full size bike with at both of the rear seats folded down, however it will lose almost all of its passenger carrying capabilities and essentially become a 2- seater.