Zipp Freehub Body (ZM1/ZR2 SL)

66 Points of Rapid Pickup. Factory Zipp Engineering.

The engineering hallmark of the Zipp ZR1 / ZM2 Freehub Body is its offset 6-pawl configuration operating in two phased groups of three, generating 66 points of engagement. With a tight 5.45° engagement angle, this system dramatically minimizes dead space in the pedal stroke. Precision-machined to exacting tolerances, it comes fully equipped with premium sealed cartridge bearings and high-durability internal seals to keep grit, wash water, and road grime out of your hub shell.

Why the Genuine Zipp ZR1 / ZM2 Freehub Belongs on Your Hub:

• Instantaneous 5.45° Power Transfer: Dual-phased 6-pawl leaf-spring design meshes seamlessly with the drive ring for 66 points of positive, instant drive uptake.

• Direct OEM Hub Integration: Engineered exclusively for Zipp ZR1 (disc-brake and rim-brake road/gravel wheels) and Zipp ZM2 (trail/enduro mountain bike) hub platforms.

• Factory-Installed Sealed Bearings: Pre-pressed with high-grade, low-friction cartridge bearings to eliminate drag and deliver silky-smooth rolling resistance out of the box.

• Drivetrain Conversion Ready: Offered in dedicated Sram XDR, Shimano/Sram 11Speed HG, and Shimano Micro Spline variants for straightforward cassette standard swaps.

• Enhanced Environmental Sealing: Fitted with robust secondary lip seals to protect delicate pawls and ratchet teeth from corrosive gravel dust and power-wash spray.

Technical Specifications:

• Hub Compatibility: Zipp ZR1 (Road/Gravel) & Zipp ZM2 (MTB)

• Engagement Mechanism: 6-Pawl Leaf-Spring System

• Points of Engagement (POE): 66 Points (5.45° Engagement Angle)

• Cassette Standards Available: Sram XDR / XD, Shimano HG 11/12Speed, Shimano Microspline

• Bearings: Precision Factory-Sealed Stainless Cartridge Bearings

• Material: Precision CNC-Machined High-Strength Alloy

The Alegro Perspective: In the stand, Zipp’s ZR1 hub was a massive leap forward for reliability compared to earlier hub generations. Sticking to the genuine ZR1/ZM2 freehub body is crucial because the pawl pocket tolerances and leaf spring tension are tuned specifically for that 66-tooth drive ring. Whether you're swapping your 303 Firecrests over to a 12Speed Sram XDR cassette or just refreshing worn pawls after a gritty cyclocross season, this factory unit drops right in, spins silent, and catches instantly the second you stomp on the pedals.

Instantaneous 66-Point Pickup. Factory Precision Tolerances. Power Your Ride with Zipp.