I got a buddy who doesn't ride much but owns a nice Fuji Roubaix. He bought it so cheap he couldn't pass it up. He does Triathlons on it 2 or 3 times per year and a few rides. Say's his lower back always hurts. I looked at it and it is too big. He is stretched out on it. I recommended a shorter stem and compact bars. He probably can't move the seat up much without giving up power and causing knee problems. He refuses to sell and buy the right size. Anything else he can do? How short can he go on stem without getting wierd to steer? I was thinking an 80 stem. Is that about right?