In case this is helpful, this is what Craig wrote about the seating/comfort in his review of the ride - he is 6'4" and fit in the side car:
"First off, the motorbike is definitely more accommodating for bigger and taller guests. It doesn’t appear to be modified, but the restraint just closes on you differently because of the position you are in. With the motorbike, I don’t see height as an issue at all, but guests with bigger hips and waists may have more difficulties.
The sidecar is a different story. The seating for the sidecar is more traditional, but it is very compact. As a person who is 6 feet 4 inches, I felt like I was sitting down in the car and my legs were slightly elevated because of it. I do carry most of my length in my legs, but I’m not all legs. The problem with this seat is the restraint hit my thighs at about the half way point because of my long calfs. The restraint was still another six or seven inches away from my stomach, so there was plenty of room that way, but even then I’m not the trimmest person out there by any means. That being said, the sidecar still seems pretty accommodating, but the biggest issue will probably be for those who are tall or carry their weight in their hips."