Mark, the stiffness calculator is hard coded for specific tubing. Im not smart enough to change the formula. Id not build a 26F frame out of that material. It will be too stiff.
A good frame will have just the right amount of vertical deflection. Too little and it wont work. Too stiff and it becomes a rolling mill trying to make everything the same thickness.
The 26F is my favorite frame. If i could only have 1 ewheel, it would be that.
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Kerry Pinkerton
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