Power transfer on a climbing wheel determines whether your watts reach the road or dissipate into flex and deflection. The Mavic Cosmic SL 32 Disc Carbon Rear Wheel addresses this through the Infinity hub platform, which optimizes spoke tension distribution across all 24 spokes using a non-contact lacing pattern that eliminates the creaking some wheels develop under load. The design runs silently whether you're seated and spinning a steady tempo or standing and driving hard over a steep pitch, translating effort into forward motion without the energy losses that plague less refined hubs.

The 32mm unidirectional carbon rim keeps weight low where it matters most on mountain roads. UD layup orients all fibers in the same direction, shedding grams while maintaining the lateral stiffness needed to keep the wheel tracking true under the torque spikes that hard accelerations and out-of-saddle efforts generate. At 795 grams, this rear wheel pairs with the 680-gram front for a 1475-gram wheelset that rewards climbers without the compliance issues that plague ultralight builds focused purely on scale numbers.

Mavic's Instant Drive 360 freewheel delivers quick engagement that transforms pedal input into immediate acceleration. The mechanism uses a contactless rubber seal that reduces friction while maintaining durability across thousands of miles, and the fast pickup proves especially valuable when rhythm changes demand instant response — accelerating out of switchbacks, covering attacks, or simply maintaining momentum when the gradient fluctuates. The aluminum hub body houses QRM Auto bearings with automatic preload adjustment, providing smooth rotation without developing play over time.... Read More