Fast and light!
- Familiarity: I've put it through the wringer
Great in windy conditions and just an overall really good wheel, especially for the price compared to Zipp and Enve.
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Nowadays, carbon wheels are pretty much mainstream on all disciplines of racing bikes, but we remember a time when road race start lines at the professional and amateur level saw a heavy dose of Mavic's light and nearly bombproof Ksyrium hoops. With alloy rimmed wheels now more often relegated to training wheel status, many generations of Ksyriums still get called into duty for winter base miles and patiently waiting in the wheel pit or truck while its cousin, the carbon Cosmics, get the nod on race day. Well, the Ksyrium's gone Carbon too and its Ksyrium Pro Carbon SL UST Disc Wheel is ready to rewrite the books and serve as a loyal training or race day wheel.
Mavic might have been late launching a full-carbon rim, but it took its time to make sure the technology was ready for it. Always placing safety at the forefront, Mavic's carbon offerings used to only consist of aluminum-bedded rims with the firm citing concerns over safety and braking performance with full-carbon rims. Things change slightly with this being a disc brake going wheel, removing the constraints of heat management and pressure of braking blocks against the rim. A new concern exists, however, and that's the exacting dimensions needed for easy yet reliable tubeless setup. We can happily report that Mavic is fully on board with road tubeless and in both setup and in use, Mavic's UST protocol is simply class leading.
Mavic uses 3K carbon fibers to shape the rims in a bullet-nose profile. While the wheels aren't specifically called out as "aero," Mavic constructed it specifically with climbing and endurance riding in mind, so the 32mm-deep sections are dependably stable while riding in crosswinds and tackling twisty, long descents, and they'll provide a touch more radial flex to dissipate bumps. Mavic also paid close attention to the wheels' impact resistance, ensuring the wheels will be able to withstand long days on chip-sealed roads and weather-beaten shoulders while you're dreaming of glass smooth tarmac.
Though Mavic tends to privilege tradition, this wheel proves it isn't afraid of a well-executed change. In addition to the full-carbon rim, Mavic updates the venerable Ksyrium with its new a ratchet-ring freehub system. The design, referred to as Instant Drive 360, is centered on a 40t, dual-ratchet construction that boasts nine degrees of engagement. This marks a significant step forward for factory-built wheels because it enjoys responsiveness and longevity normally reserved for third-party hubs on hand-built wheels. The Instant Drive 360 hubs also feature more reliable, no-contact seals as a barrier against damaging road grit, and they save a claimed 40g compared to the FTS-L hubs.
The Ksyrium Pro Carbon SL UST Wheel includes Mavic's signature 28mm wide Yksion Pro UST tires with 11 Storm compound rubber. The tires receive a nylon breaker for puncture protection and each wheel is also packaged with sealant, quick release adapters, rim tape, tubeless valves, and a syringe.