The light carbon rimed ksyrium for disc brake bikes the ksyrium pro carbon sl c disc brings the benefits of a superlight carbon clincher wheel to the world of road disc bikes whether your bikes designed for long distance adventure or fast climbing the ksyrium pro carbon sl c disc is the best way to add to its ability one of the lightest carbon clinchers everat just 405g the rim is one of the lightest in the carbon clincher field a bladder construction used in conjunction with our ultra l