(Ultimate) tensile strength has nothing to do with stiffness. It is the amount of tensile (not compressive) stress the material can handle before it fails. Scooper hit the nail on the head. But I'm just a Professional Engineer.
BTW, that is one CRAZY colored bike, in a good way. I don't think you need reflectors for night riding on that thing.
Why am I helping feed the zombie?
Someone call an exorcist.