this is great info 10 years later
Ha! Lack of sleep wearing on me.Math must evade you or you're from the future??
More like if you can shove your arm into the forearm or elbow area. I have a "flatter back" and when I stand against a wall my hand slides into about the begining of my palm. We all have curvature in our spines ,it is a matter of how much. X-curve is meant for people with generally more curve than most. The best way is to try out the frames with weight after the "wall test".Re "flat back" vs a "curved back"... I was told to stand with my back against the wall. If I can fit my hand between the wall and the small of my back, I have a "curved back". If I can't, my back is pretty flat. Is that still the standard way to measure this?
Gave this a shot and made it to about my wrist.More like if you can shove your arm into the forearm or elbow area. I have a "flatter back" and when I stand against a wall my hand slides into about the begining of my palm. We all have curvature in our spines ,it is a matter of how much. X-curve is meant for people with generally more curve than most. The best way is to try out the frames with weight after the "wall test".