As carbon-spoke technology continues to develop, road wheel manufacturers are looking for hub designs that provide better spoke tension distribution, structural stability, and weight optimization.
Choosing a suitable hub is particularly important for asymmetric carbon-spoke wheelsets. The spoke layout, spoke interface, engagement mechanism, and material selection all influence the overall wheel design.
The ARC MT-105F/R Carbon Spoke Road Hub is engineered specifically for modern road disc brake wheel builds. Featuring an 18-hole front and 21-hole rear 2:1 spoke configuration, a dedicated 4.2mm carbon-spoke interface, and a lightweight aluminum construction, this hubset provides a specialized solution for premium carbon-spoke road wheel development.
1. Asymmetric 2:1 Spoke Design for Better Wheel-Building Balance
One of the key features of the ARC MT-105F/R is its asymmetric 2:1 spoke configuration.
The hubset features:
- Front hub: 18 holes.
- Rear hub: 21 holes.
- Spoke layout: 2:1 configuration.
Unlike conventional symmetrical spoke arrangements, a 2:1 configuration uses different spoke distributions to address the tension differences between the two sides of a wheel.
This arrangement is particularly relevant to rear wheels, where drivetrain and cassette positioning create different spoke bracing angles and tension requirements.
For carbon-spoke wheel manufacturers, the 18H front and 21H rear configuration provides a dedicated platform for developing lightweight road wheelsets with carefully planned spoke layouts.
2. Dedicated 4.2mm Carbon Spoke Interface
Carbon spokes are different from traditional steel spokes in both their shape and connection requirements.
A suitable hub must provide an interface that matches the spoke head design and dimensions.
The MT-105F/R features dedicated 4.2mm carbon-spoke holes, with Hongji Weiye B-type round-head bladed carbon spokes as the standard configuration.
This specialized interface is designed to provide a precise connection between the hub and the selected carbon spokes.
For wheelset manufacturers, it is important to confirm the spoke manufacturer’s specifications, head dimensions, and interface compatibility before production.
This helps avoid mismatches during wheel assembly and ensures that the selected components work together as intended.
3. Lightweight 328.5g Hubset Construction
Reducing wheelset weight is an important objective in premium road cycling.
The ARC MT-105F/R uses a combination of forged aluminum components to balance weight optimization and structural performance.
Its material configuration includes:
- AL6061-T6 forged aluminum hub shell.
- AL7075 forged aluminum axle.
- AL7075 forged aluminum freehub body.
- AL7075 forged aluminum end caps.
The complete hubset weighs approximately 328.5g ±5g, with the following measured weight distribution:
- Front hub: 92.4g.
- Rear hub: 236.1g.
This lightweight construction helps wheel manufacturers develop road wheelsets with reduced hub component weight while maintaining a carefully engineered structural design.
4. 36T and 54T Ratchet Engagement Options
The engagement system is another important consideration when selecting hubs for high-performance road wheelsets.
The MT-105F/R offers two ratchet configurations: 36T and 54T.
Compared with conventional pawl-based engagement systems, a ratchet mechanism uses distributed tooth contact to transfer pedaling torque.
The larger engagement interface is designed to distribute drivetrain loads across the ratchet contact area, helping reduce localized stress and improve engagement consistency.
The availability of 36T and 54T configurations also allows wheel brands to select different engagement characteristics according to their product positioning and performance requirements.
5. Patented One-Piece Ratchet Architecture
The ARC MT-105F/R incorporates ARC’s patented one-piece ratchet architecture.
This integrated design combines the engagement structure into a single precision-engineered component.
Its design advantages include:
- Improved structural rigidity.
- Reduced component complexity.
- More consistent machining accuracy.
- Optimized structural weight.
- More convenient assembly and maintenance.
For bicycle brands and wheelset manufacturers, a well-engineered engagement structure is an important part of long-term product development.
The one-piece architecture provides a distinctive technical feature for brands seeking alternatives to conventional hub engagement designs.
6. Multiple Freehub Standards for Road Drivetrain Compatibility
Different road cycling markets and wheelset brands may use different drivetrain systems.
To accommodate various requirements, the MT-105F/R offers multiple freehub standards:
- Shimano HG.
- Shimano Micro Spline Road (MS-Road).
- SRAM XDR.
- Campagnolo N3W.
- Campagnolo 11/12-speed.
This selection gives wheel manufacturers greater flexibility when developing road disc brake wheelsets for different drivetrain platforms.
The exact freehub version should be selected according to the intended cassette and drivetrain specifications.
7. Technical Specifications of ARC MT-105F/R
| Specification | Details |
|---|---|
| Model | ARC MT-105F/R |
| Hub Shell Material | AL6061-T6 Forged Aluminum |
| Axle Material | AL7075 Forged Aluminum |
| Freehub Body Material | AL7075 Forged Aluminum |
| End Cap Material | AL7075 Forged Aluminum |
| Brake Interface | Road Disc Center Lock |
| Front Spacing | 12×100mm |
| Rear Spacing | 12×142mm |
| Front Spoke Holes | 18H |
| Rear Spoke Holes | 21H |
| Spoke Layout | 2:1 |
| Carbon Spoke Interface | 4.2mm |
| Standard Spoke Configuration | Hongji Weiye B-Type Round-Head Bladed Carbon Spokes |
| Engagement System | 36T / 54T Ratchet |
| Freehub Options | HG / MS-Road / XDR / N3W / Campagnolo 11/12S |
| Standard Bearings | S&S Steel Bearings |
| Optional Bearings | ENDURO / CeramicSpeed |
| Complete Hubset Weight | 328.5g ±5g |
| Front Hub Weight | 92.4g |
| Rear Hub Weight | 236.1g |
8. Why Choose ARC MT-105F/R for Carbon-Spoke Road Wheel Projects?
For bicycle brands, carbon wheel manufacturers, and professional wheel builders, the ARC MT-105F/R combines several specialized features for modern road wheel development.
Dedicated 2:1 Configuration: The 18H front and 21H rear layout provides a specific asymmetric spoke arrangement for carbon-spoke wheel construction.
Specialized Carbon Spoke Interface: The 4.2mm interface is designed for the specified Hongji Weiye B-type round-head bladed carbon spokes.
Lightweight Construction: A complete hubset weight of approximately 328.5g supports lightweight road wheel development.
Advanced Ratchet Technology: 36T and 54T engagement options provide flexibility for different performance requirements.
Multiple Drivetrain Options: Several freehub standards support different road cassette systems.
Together, these features make the MT-105F/R a specialized hub solution for manufacturers developing lightweight carbon-spoke road disc wheelsets.
9. Looking for a Carbon Spoke Road Hub Supplier?
Developing a competitive carbon-spoke wheelset requires more than selecting lightweight components. Manufacturers must also consider spoke compatibility, hub geometry, engagement structure, machining quality, and production consistency.
ARC specializes in bicycle hub manufacturing, providing hub solutions for different cycling applications and wheelset development projects.
If you are a bicycle brand, carbon wheel manufacturer, or professional wheel builder looking for a specialized carbon spoke road hub, the ARC MT-105F/R is worth considering.
Explore the ARC Bicycle Hub product range to learn more about our hub manufacturing capabilities and available product configurations.
For OEM/ODM projects, contact the ARC team to discuss your technical requirements, spoke specifications, and potential cooperation opportunities.
ARC – Specialized Bicycle Hub Manufacturing for Advanced Wheelset Development.