What's the most common cause of lower back pain?
After 20miles it starts to ache, after ~40 I can only ride standing up.
I've tried to lower the saddle, slide it back/forward, change handlebar angle... no change
This is really really ****ing me off. I've been training solo for a couple of months to rack up the confidence to join a club for the first time. Got 700miles in the saddle, hill repeats, intervals, flat-out sprints to school but nothing on endurance. SOMEBODY HELP!!! IS THE POSITION FAULTY OR IS MY BACK TOO WEAK?!?