Tune has Unveiled the Nano CS

German lightweight component manufacturer Tune has officially announced its latest flagship hubset: the Nano CS. Designed specifically for modern carbon-spoke wheel builds, the "CS" suffix stands for Carbon Spokes. The Nano CS platform addresses the unique geometric and mechanical challenges of carbon spokes, offering a safer, stiffer, and extraordinarily lightweight foundation.

The Core Innovation: Patented Spoke Alignment

Unlike traditional configurations that rely on compromise or open slots, the Nano CS introduces a proprietary, ball-milled spoke hole geometry.

Self-Aligning Trajectory: The specialized round-head interface allows oversized 5.5mm carbon spoke heads to pivot and settle naturally in direct alignment with the rim hole.
Stress Minimization: By guaranteeing a 100% straight spoke line, the hub completely mitigates lateral bending fatigue at the spoke head.
Mechanical Security: Utilizing closed, complete spoke holes rather than open slots ensures the spoke remains safely captured within the hub shell during hard impacts or sudden crashes.

Uncompromising Durability & Performance

Despite its minimalist weight, the Nano CS platform is engineered to survive the most demanding real-world riding conditions:

Stiffness & Weight Gains: In internal laboratory testing, a 24-spoke wheel built using Nano CS hubs and Tune Carbon Aero spokes yielded an approximate 10% increase in lateral stiffness while reducing total system weight by 5% to 6% compared to an equivalent wheel built with Sapim CX-Ray steel spokes.
Extreme Load Testing: The Nano CS freehub and load paths were tested to withstand torques up to 700 Nm before failure—a torque level comparable to automotive engines, providing a massive safety margin for high-torque cyclists. Impact resistance was verified using Tune's "Guillotine" 40-kg drop-test bench.
Weatherproof Shielding: Features an advanced multi-layered sealing network. The Center Lock lockring acts as the primary barrier against high water pressure, while the secondary end-cap layers protect the internal bearings from dirt and grime.
Drivetrain Versatility: Out of the box, the rear hub utilizes the race-proven POEtry 69 freehub system (3 pawls, 69 engagement points) to keep coasting drag exceptionally low. For riders seeking near-instantaneous power transfer, it can be easily upgraded to the POEtry 138 system by adding 3 additional pawls and springs.

Compatibility Blueprint:

Rim Range: Universally compatible with almost all common rim sizes (offset from 1mm to 3mm, minimum ERD/NSD from 470mm up to 32"+).
Note: 20-inch and 24-inch rims are excluded, and road depths ≥ 65 mm require confirmation via Tune's digital spoke calculator.
Spoke Requirements: Optimized exclusively for oversized 5.5mm round-head carbon spokes (such as TUNE Carbon Aero or compatible Vonoa/Sapim variants) with an aero width under 4.0mm. Not compatible with T-head or traditional steel spokes.
Building Requirements: Wheel builders must calculate exact carbon spoke lengths using Tune's online calculator based on Nipple Seat Diameter (NSD) and rim offset rather than estimating from steel spoke measurements. During truing, the steel threaded end of the Tune carbon spoke can be held with a tool externally, preventing twist forces on the carbon fiber shaft.

As an official Tune partner, we offer the complete line of Tune hubs in every available color. Feel free to reach out for inquiries!

Key Specifications at a Glance

Hubset Weight (±3%)	278g (20/20h XDR) \| 288g (24/24h XDR) (Front: 81g/90g; Rear: 197g/198g)
Color	Black, Silver
Axle Standards	12x100 mm Front / 12x142 mm Rear (Center Lock Disc)
Spoke Hole Options	20 or 24 holes (Front & Rear)
Max Spoke Tension	1200 N
Weight Limits	Max Rider Weight: 120 kg \| Max System Weight: 130 kg
Freehub Options	SRAM XDR, Shimano HG, Shimano Micro Spline, Campagnolo N3W
Freehub System	POEtry 69 (3 pawls, 69 points of engagement; upgradable to POEtry 138 with 6 pawls)
Bearings & Warranty	Enduro ABEC-5 (10-year warranty) or Enduro XD-15 Hybrid Ceramic (Lifetime warranty)
Price	€750 (Standard) / €1,380 (Ceramic)

FAQ

Can I use Nano CS with normal steel spokes?

Nano CS was developed for oversized round-head carbon spokes, not for standard steel spokes. The hub interface is optimized around a larger spoke-head diameter and a dedicated spoke-seat geometry. For this reason, standard steel spokes should not be used unless they have been specifically checked and approved for the Nano CS interface. To the best of our current knowledge, as of June 2026, no steel spoke is compatible with the common carbon-spoke interface used on Nano CS.
Can I use Nano CS with any carbon spoke?

No. Nano CS is designed for oversized round-head spokes with a 5.5 mm head diameter. Not every carbon spoke on the market uses this geometry. Before building, the spoke-head shape, diameter, construction, and seating behavior must be checked. Tune carbon aero spokes are developed specifically for Nano CS and are the recommended solution.
Can I reuse the spoke length from my old 24-hole wheel?

No. The spoke length from an existing steel-spoke wheel should not be copied. Nano CS has its own hub geometry, spoke interface, and build requirements. Carbon spokes also require a more precise spoke length than steel spokes. The correct length must always be calculated specifically for the chosen Nano CS hub, rim, nipple system, and lacing pattern. To the best of our current knowledge, as of June 2026, no steel spoke is compatible with the common carbon-spoke interface used on Nano CS.
What is NSD?

NSD stands for Nipple Seat Diameter. It is similar to ERD, or Effective Rim Diameter, but it refers more precisely to the diameter at the actual nipple seat in the rim. For Nano CS builds, NSD is the preferred value because it gives a more accurate reference for calculating carbon spoke length. ERD can vary depending on the nipple type and how it is measured, while NSD gives a more precise starting point. Please refer to Tune's online spoke length calculator, where the difference between ERD and NSD is explained in detail.
Which rims are not compatible?

Nano CS is compatible with a wide range of common rim geometries, but not every rim can be used. Very small rims, such as 20-inch and 24-inch rims, are not covered. Very deep road rims from around 65 mm and above can also become geometry-dependent, especially depending on rim offset and spoke angle. Rim NSD or ERD as well as rim offset must always be checked before building.
Can I use a 65 mm or deeper rim?

Possibly, but it must be checked individually. Deep rims can create more demanding spoke angles depending on ERD, NSD, rim offset and drilling direction. Nano CS offers broad compatibility, but very deep rims should always be verified using the Tune spoke length calculator and compatibility data before ordering spokes.

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August 12th, 2026 | Light Bicycle

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