The Mavic Ksyrium SL Heritage Disc Wheelset is a light and durable alloy wheelset made for reliable road performance. Its 400g ISM4D rims reduce rotating weight for quicker acceleration and precise handling. A stiff rim, stable Infinity hubs and UST Road tubeless technology support efficient power transfer, comfort and control.Key Features and Benefits:400g ISM4D rims: ISM4D machining removes excess material from low-stress parts of each rim while keeping strength in key areas. This cuts rotating weight and helps the wheels respond faster when you accelerate or climb. The complete wheelset weighs 1575g, with a 723g front wheel and an 852g rear wheel.Fore rim construction: Fore technology keeps the upper rim bridge solid, so spoke holes do not pass through the full rim bed. This makes the rim stiffer and removes the need for rim tape. It also saves around 60g and reduces the number of parts needed for a tubeless setup.Aero spokes and compact rim profile: Patented lightweight aero spokes reduce drag while supporting firm lateral control. The 22mm-deep and 19mm-wide rims keep weight and inertia low. This gives the wheels a quick response without adding excess depth or bulk.Infinity hub platform: The Infinity hub uses a stiff axle, durable bearings and a revised hub body. These parts support the wheel under pedalling and cornering loads. The result is stable tracking, smooth rotation and dependable use over high road mileage.ID360 freewheel system: The Instant Drive 360 freehub uses two interlocking ratchets to provide quick engagement. Power reaches the rear wheel with less delay when you start pedalling or increase your effort. This supports a direct and controlled response on climbs and changing road gradients.UST Road tubeless system: The sealed rim bed allows tubeless tyres to run without an inner tube or rim tape. Lower friction can improve rolling efficiency, while reduced tyre pressure can add grip and comfort. The shaped rim bed also makes compatible tyres easier to fit and remove.Wide freehub compatibility: Freehub options include Shimano HG Road, Shimano Micro Spline, SRAM XD, SRAM XD-R, Campagnolo ED11 and Campagnolo N3W. This range supports many common road and gravel drivetrains. The correct freehub lets the wheelset work with your chosen cassette without an unsuitable conversion.Extended warranty and crash replacement: Registration extends the standard two-year warranty to three years. Mavic also provides three years of extra cover for its aluminium wheels and access to a crash replacement discount. This gives added support if the wheels are damaged in an accident.This wheelset provides the balance needed from an everyday road upgrade. Its low rotating weight supports a fast response, while the stiff rim and hub design keep the bike stable under load. Tubeless compatibility can also improve comfort and reduce puncture risk, making the wheels suitable for regular training, long road rides and faster group use.Choose the Mavic Ksyrium SL Heritage Disc Wheelset for a light, responsive and practical alloy setup backed by long-term product support.Specification: Pair: 1575gRear: 852gFront: 723gDisc Rotor; Centre Lock