King of the mountainsif youre going to push your limits you need full confidence in your equipment so for us its never been a question of sacrificing reliability for weight or stiffness instead the ksyrium line has always offered the unbeatable combination of low weight but high stiffness comfort and reliability so when we decided to give light carbon rims to the ksyrium for the first time they had to be the same super light and totally reliablereach the top fastthanks to several years