I am in the process of buying a new bike. I also have chronic upper and lower back pain that unfortunately I will deal with forever. I probably average between 20-30 mile rides 2 to 3 times a week as time allows. Would a tri bike be easier on my back for those distances. I am not looking for all out racing performance(as I dont race).The group i ride with are probably b+ level riders.Just looking to ease the pain.