Need your advice about back pain

My wife complains that she experiences lower back pain after riding her bike.

I’ve messed with the height of her stem, position of saddle, but still she is in pain. Any suggestions? By the way she’s riding a mountain bike.

About the author

As one of the original founders of BikeCommuters.com. He has helped build this site into one of the leading and oldest bicycle commuting blog sites. Filled with passion for everything two wheels, RL Policar covers a multitude of subjects from product reviews, news, articles and technical how to's.