King of the Hipsters
Join Date: Jan 2005
Location: Bend, Oregon
Bikes: Realm Cycles Custom
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Lower back pain, especially if it localizes on one side more than the other, often reflects body mechanics as much as fit.
Body mechanics, in turn, flow out of spinal flexibility.
If you cannot afford a physical therapist who specializes in Feldenkrais therapy, or one of the other movement therapies, try taking a class in yoga or getting a book on yoga for back pain.
I haven't read the following book, but the reviews seem good.
As for fit, raising the bars seems obvious, but in the case of lower back pain, the distance between the bars and the saddle matters, as well as the fore and aft placement of the saddle in relation to the crank bearing.
Spin can make a difference.
Some lower back pain comes from excessive mashing.
We all mash more than we think we do.
Riding with cleats (as opposed to clips and straps) allows the rider to pull up on the pedal sooner in the spin, and this will reduce mashing and often will reduce lower back pain.
So, work on back flexibility, move the handle bars and the seat around, and try to pull more and mash less.