According to the chart on this thread(see link), you are correct and Zirbel was running it over Red as you can see in the picture. I have Rival on one of my bikes and I am 185lb with big legs (most of my weight is my lower half), no issues here.
http://www.bikeforums.net/showthread...rival+crankset
Originally Posted by
Youngin
Rival is one of the stiffest cranks out there. I'm aiming for one later in the year as well.