Fibers are the basis of the frame. Simplon uses unidirectional high modulus carbon fibers from the Japanese technology leader Toray. These have 65 to 85 percent more tensile strength than conventional carbon fibers. The racing bike top models use ultra-high modulus carbon fibers (90 percent higher tensile strength!). The resulting higher frame stiffness provides additional safety, especially at high speeds. Your benefits: low weight, efficient propulsion, high stability and directional stability.