Originally Posted by
Sikbug
I have this problem as well. Do you think it can be from a bike being too small or the seat position not being high enough?
The most common causes of upper back pain are:
1. poor posture on the bike
2. poor core strength
An easy indication of poor posture is locked elbows. You should always ride with a bend in your elbows. If you have a hard time riding with bent elbows, you may need to adjust your handlebar position (probably upward) or even your saddle position (probably downward). Improving your core fitness (exercising your torso muscles) can also help a lot.