The Reserve 44 Zipp ZR1 ST Carbon Rear Wheel strikes the perfect balance between lightweight responsiveness and aerodynamic efficiency. With a 44 mm rim depth, this wheel is engineered for all-round performance — quick on the climbs, smooth on the flats, and composed through crosswinds. Combined with Zipp’s precision-built ZR1 hub and Shimano HG or SRAM XDR compatibility, it delivers effortless power transfer and the kind of refined ride feel that defines Reserve’s reputation for real-world speed.

The 44 mm rim profile embodies Reserve’s all-conditions versatility. It’s deep enough to cut through the wind yet shallow enough to maintain control in unpredictable gusts. The carbon structure is hand-laid using Reserve’s proprietary lay-up for tuned stiffness, strength, and vibration damping. The aerodynamic shaping has been refined through CFD modeling and outdoor validation, producing consistent drag reduction across a wide range of yaw angles. Paired with a 25 mm internal width, the wheel is optimized for 28–40 mm tires, giving a stable, rounded tire shape that improves grip, comfort, and rolling efficiency across every mile.

At the core, Zipp’s ZR1 ST hub defines mechanical precision and reliability. Its German-engineered design uses fully sealed cartridge bearings for ultra-smooth, low-drag rotation in all conditions. The 66-point ratchet engagement system ensures near-instant power delivery when accelerating, sprinting, or climbing out of the saddle. The lightweight forged-aluminum shell and refined flange geometry distribute spoke tension evenly, improving lateral stiffness and power transfer. With the Shimano HG or SRAM XDR freehub body, the interface is perfectly matched to modern 12-speed drivetrains, locking in efficiency and long-term dependability.... Read More