Mavic Cosmic SLR 45 Disc Wheelset

The Mavic Cosmic SLR 45 Disc Wheelset occupies a specific and demanding position in the carbon wheel market: light enough to climb without penalty, deep enough to carry speed on open roads, and tubeless-ready without the usual setup friction. At 45 mm of rim depth, this is a wheelset sized for versatility — not a pure time trial weapon, not a climber's featherweight, but a fast, capable road wheel that earns its place on race day and holds up through long training blocks.

Mavic built the rims from 100% unidirectional carbon using their UD² laminate process, a construction method that prioritizes fiber orientation for a measured balance of stiffness and weight. That 45 mm profile sits in a depth range that pulls in two directions at once: enough rim height to generate meaningful aerodynamic advantage at pace, while remaining manageable in crosswind conditions that would punish a deeper section. The 23 mm internal width reflects the industry's shift toward wider tires — the kind that offer lower rolling resistance and better compliance on imperfect road surfaces without requiring you to give anything back on speed.

The detail that defines this wheel within Mavic's lineup is the Fore Carbon tapeless rim bed. Rather than drilling spoke holes through the rim floor and covering them with tape, Mavic engineered the rim to maintain a sealed, structurally continuous bed. No tape means no tape failure, no re-taping after a season of use, and a cleaner tubeless setup from the first install. It reduces one of the more persistent frustrations in tubeless maintenance and trims weight in the process. It's the kind of considered engineering that distinguishes a well-built wheel from one that's simply well-marketed.

Design Benefits

1. Tapeless Tubeless Setup: The Fore Carbon tapeless rim bed keeps the inner rim floor structurally intact — no drilled holes means no tape to install or maintain. Tubeless setup is more reliable and more consistent, and it stays that way across the life of the wheel rather than degrading as rim tape ages or shifts.
2. UD² Carbon Construction: Mavic's unidirectional carbon laminate process is designed to align fiber orientation for an optimized balance of stiffness and weight. The result is a rim intended to transfer power efficiently without unnecessary mass — relevant whether you're accelerating out of a corner on a criterium circuit or pushing tempo on a long road ride.
3. Versatile 45 mm Depth: Forty-five millimeters is an aerodynamic depth that works across a wide range of riding conditions. It generates enough rim height to hold speed on flat and rolling terrain while stopping well short of the depth that makes crosswind management a full-time job. For riders who train and race on varied courses, that balance matters.
4. Wide Internal Width for Modern Tires: The 23 mm internal width is built for the tire sizes that performance road riding has converged on — 28 mm and 30 mm tires that roll faster and absorb road vibration better than the narrow rubber that used to dominate. Running a wider tire on this rim doesn't require compromise; the geometry supports it by design.
5. Disc-Specific Engineering: Braking load on a disc wheel is transmitted through the hub rather than the rim, which allows Mavic to optimize the rim structure without accounting for braking surface wear or heat. The disc-specific build supports consistent, confident braking in wet conditions — an advantage that becomes apparent when descending in variable weather.

Final Take

The Cosmic SLR 45 is a wheelset for riders who race seriously and train at a level that demands equipment their wheels can keep up with. Thoughtful engineering details — the tapeless rim bed, the UD² carbon construction, the wide internal channel — add up to a disc tubeless wheel that performs without demanding constant attention. If you want a fast, reliable carbon road wheelset that works as hard in training as it does on race day, this is a considered choice.