No matter the course or the conditions, Mavic's Ksyrium SLRs are built to excel. Mavic's feathery Maxtal aluminum rims are laced to their sublimely smooth QRM+ hubs with aero Zicral spokes to create wheels that dominate on the climbs and lay down serious speed on the flats. As an added bonus, Mavic supplies their Exalith rim treatment that boosts durability and improves all-weather braking for serious control that you can feel whenever the road tilts down. And, the SLRs come complete with Mavic's Yksion Pro clinchers that boast a firmer center tread and softer shoulders for reduced rolling resistance and increased cornering traction. Whether it's training day or race day, the Ksyrium SLRs will keep you at the head of the pack.