Are some motorcycles worse for your back than others?

I have a Honda Shadow Sabre. I used to ride a Nighthawk 750 and no problems with back pain. Now with this cruiser, I have back pain and right side pain as well.What bike would be better?have a Honda Shadow Sabre. I used to ride a Nighthawk 750 and no problems with back pain. Now with this cruiser, I have back pain and right side pain as well.What bike would be better? The Sabre is a regular cruiser a la HD but a Metric.The Nighthawk was a standard.The Sabre is an 1100 and is the right size. It just causes pain. I have taken to wearing a back belt and put on a Mustang seat. The riding isn't too painful, but the after effects are.