PRIMARO ULTRA M4 Naben-Set
PRIMARO ULTRA M4 Naben-Set
Born from light. Proven in strength.
The PRIMARO ULTRA M4 is our lightest high-performance hub for carbon spokes—engineered for maximum efficiency at minimal weight. At just 178 g per set, it sets new benchmarks in the power-to-weight ratio and is built for riders who demand uncompromising performance in road and gravel applications.
Despite its ultra-light design, it is approved for system weights of up to 110 kg combining low weight and strength at the highest level. Perfect for high-end custom builds with low spoke counts, where every detail is optimized for speed.
Spoke type
M4 fine thread (M4x0.5 interface)
The integrated M4x0.5 thread is one of the lightest and most efficient connection systems for carbon spokes. It allows the direct use of threaded spokes and creates an extremely stiff, play-free connection between hub and spoke. The result: maximum power transfer, reduced losses, and an ultra-light, highly precise wheel setup—built for riders pushing the absolute limit.
Why choose this hub set?
- Minimal wear thanks to outstanding engineering
- Direct power transfer without losses
- Sophisticated ventilation system for extended durability
- Micro-gap end caps for improved sealing against water and dirt
- Self-adjusting bearing preload for longer service life
Warranty:
Find all details about our 4-year warranty here
Technical Data
General
Intended use: Road and Gravel
Material: Aluminum
Hub color: Matte black
Spoke type: M4x0.5 carbon, double threaded
Max spoke tension: 1200 N
Weight:
178 g (front: 56 g, rear: 122 g) – XDR freehub, 20H
Max system weight: 110 kg
Brake interface: Centerlock (CL)
Holes: 20 | 24
Bearings: Enduro Bearings – Enduro Zero, Black Oxide, Ceramic Hybrid
Front hub
Front axle: 12x100 mm thru axle
Rear hub
Rear axle: 12x142 mm thru axle
Freehub: Campagnolo N3W, Shimano Microspline (MS), SRAM XDR, Shimano HG
Freehub system: Conical ratchet, 45 teeth | max. 8° engagement angle
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Why this wheelset?Minimal wear thanks to outstanding engineeringDirect power transfer with no lossesSophisticated ventilation system for longer service lifeMicro-gap end caps for improved sealing against water and dirtSelf-adjusting bearing play for extended durabilityMore info here Warranty:All details about our 4-year warranty can be found here