Picking the right carbon wheels for road riding usually means compromising somewhere. You either get an aero rim that climbs like a boat anchor, or a lightweight hoop that does nothing for your speed on flat roads.
The Mavic Cosmic SL 45 Disc is one of the more convincing answers to that problem.
The 45mm NACA-inspired rim profile is wind tunnel tested and genuinely aero, with flat spokes developed specifically to reduce drag alongside it. But at 1,555g for the pair, these aren't heavy wheels, and the 23mm rim width keeps inertia low enough that acceleration feels sharp rather than sluggish.
That combination is what makes the Cosmic SL 45 Disc sit apart from more specialised options: it's quick on the flat, manageable on a long climb, and doesn't ask you to plan your route around it.
The disc-brake-specific build works with 12mm thru-axles and gives you the braking consistency that rim brake carbon can't match in wet or variable UK conditions.
UST Road Tubeless compatibility is straightforward to set up and brings the ride quality improvement that tubeless is known for: less road buzz, better grip, and the option to run lower pressures without pinch flat risk.
New hubs and spokes contribute to a lively, responsive feel that you notice most when accelerating out of corners or cresting a rise. High lateral stiffness means power goes where it should, without any of the flex that can make cheaper carbon wheels feel vague under load.
For UK riders wanting Mavic wheels that genuinely work across all road conditions rather than just one type of riding, the Cosmic SL 45 Disc makes a strong case.
Weight:
- Pair: 1,555g
- Rear: 835g
- Front: 720g
Freehub compatibility:
- HG / M11: Shimano HG Road 11/12-speed (other speeds with spacer)
- XDR: SRAM XDR
- N3W: Campagnolo 13-speed