Syncros Capital SL Aero 60mm Disc Wheelset

The Syncros Capital SL Aero 60mm Disc Wheelset sits at the top of Syncros' road wheel lineup — a 60mm deep-section carbon disc wheelset built around a patented manufacturing approach the brand calls the Monocoque Wheel System. At $4,600, these wheels are engineered to compete at the highest level of road aerodynamics, and the engineering behind them is genuinely different from most carbon wheelsets in this price range.

Monocoque Wheel System

Most carbon wheels are assembled from discrete components: rim, spokes, hub shell. The Capital SL eliminates that distinction. Using its patented MWS one-shot manufacturing process, Syncros produces the rim, carbon spokes, and hub flanges as a single integrated carbon structure. This is not a cosmetic distinction — it changes the fundamental properties of the wheel. Without a conventional hub shell between the flanges, the hub diameter shrinks, the flanges improve aerodynamic flow, and the entire structure loses weight without losing rigidity. The carbon spokes don't attach to the rim in the traditional sense; they run continuously from one side of the rim over the hub flange and back, woven at the intersection to maximize torsional stiffness. Syncros reports these bonded carbon spokes are 35% stronger than traditional steel spokes, and the pre-tensioning process built into MWS achieves higher spoke tension than comparable carbon-spoked designs.

The complete wheelset weighs 1,290 grams — competitive for a 60mm disc wheelset — but the figure that matters more in real riding is rotational inertia. MWS concentrates mass near the hub rather than the rim, and Syncros' testing showed 20% lower rotational inertia compared to competitor wheels. Lower rotational inertia translates directly to faster acceleration from every pedal stroke, a livelier response when standing out of a corner, and less fatigue from the constant micro-accelerations of road racing and hard group rides.

Aerodynamic Development

The 60mm rim depth in the Capital SL Aero reflects a deliberate choice for maximum aerodynamic advantage on flat-to-rolling terrain. Syncros ran nearly 200 rim configurations through CFD simulation before settling on the final profile, optimizing at multiple yaw angles to ensure real-world crosswind performance rather than straight-line numbers only. The design was then validated in a wind tunnel purpose-built to measure both rotational and translational drag — most wheels are only tested for translational drag, so Syncros' process captures a more complete picture of what happens at speed. According to Syncros' testing, the Capital SL Aero outperformed the closest tested competitor wheel by approximately 7%. The front and rear wheels are designed as a paired system: the front profile is tuned for direct aerodynamic exposure, while the rear takes advantage of the sheltering effect from the frame and legs — different optimization goals for different positions on the bike.

Hookless Rims and Tire Compatibility

The Capital SL uses hookless rim construction, removing the traditional bead hook from the rim's inner edge. A hookless rim section is structurally cleaner and more consistent — lighter, with a smoother aerodynamic transition from tire sidewall to rim. The 25mm internal width supports modern wide tires and balances aerodynamic drag against the rolling resistance benefits of larger tyre volume.

Because this is a hookless wheelset, it requires tubeless-compatible tires that are approved for hookless rim use. Maximum tire pressure is 72.5 psi (5 bar) — a hard limit inherent to hookless design. Syncros maintains an approved tire compatibility list on their website covering road and gravel options from major manufacturers; verifying your preferred tire is on that list before purchase is strongly recommended. The version at RA Cycles uses an XDR driver, compatible with SRAM's XDR cassette interface.

Syncros backs the Capital SL with a crash replacement program: 50% off a replacement wheel within the first year from purchase, 30% in year two, and 20% in year three. The wheels carry a 2-year statutory warranty. For a wheelset at this price that you'll likely ride hard, both are worth factoring into the overall value.