Hey Brian. As you assume, the G16 geometry has been the element to help rid me of back pain. Its length helps but more so it's the steep STA. I've found that being spread more _and_ having my weight moved forward on the bike has been a huge help with my lower back. From this position, I can drive through the pedals better and keep stronger form. The longer rear helps too and this combination provides more traction with less maneuvering in the cockpit. This results in a quieter body, producing less "humping" to keep things moving. Hope this helps.
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