Originally Posted by
Drakonchik
You are not factoring in that you must compare parts (ti vs cro-mo) that displace the exactly the same dimensions, volume and thickness etc. Then plug in your analysis and ti will fall down in the shear strength dept vs high-end cromo.
Mark Kelly's strength numbers are
per square inch or per square mm so, if 6/4 Ti is stronger than the commonly used Cr-Mo alloy per square inch and the square inches (spindle cross sections) are the same, the Ti spindle is indeed stronger.
That said, many load bearing Ti components have a recommended maximum rider weight. Speedplay says the Ti axle versions of their pedals should be limited to riders under 185 pounds.