CNC (Computer Numerical Control) technology has transformed  part manufacturing. This method leads to the creation of precise, customizable components. CNC technology ensures products meet high precision standards and offers customization opportunities.

The emergence of CNC bike parts marks a significant evolution in cycling technology. This advancement allows for precise customization in both function and design. Manufacturers now meet specific needs in bike performance and aesthetics through CNC machining. This technology sets new standards in the cycling industry.

This guide explores CNC use in producing bicycle components. CNC's key role is to ensure parts are precision-made, directly impacting ride quality.

Custom CNC Bike Parts Manufacturing

1. Understanding CNC Machining for Bike Parts

CNC machining is crucial in modern manufacturing, particularly for bicycles. This technology uses computer-controlled machines for precise shaping and fabrication. It is an automated process driven by pre-programmed software. This eliminates manual intervention and reduces error risks.

Advantages of CNC in Manufacturing Bicycle Components

  • Precision and Accuracy:

The foremost advantage of CNC in bike part manufacturing is its unparalleled precision and accuracy. CNC machines operate with meticulousness, ensuring each component, whether a sprocket wheel or a frame, matches exact specifications. This consistency is crucial in producing multiple units or creating diverse custom parts.

  • Ease of Fabrication:

CNC technology simplifies the fabrication of complex bicycle parts. Its capacity to handle materials of varied geometrical shapes and compatibility with a range of materials enhances its appeal. This ease of operation is crucial for rapidly designing and producing intricate components.

  • Customization:

CNC machining stands out for its customization capabilities. This technology enhances bike manufacturing. It allows precision in creating tailored bike components. CNC machining can modify each bike part. From chains to frames, it offers a personalized touch to bicycles. This process ensures a unique riding experience. Each element reflects specific rider needs.

  • Cost-Effectiveness:

Despite its advanced capabilities, CNC machining is cost-effective. Its rapid production ability and automation reduce material waste and labor costs. This efficiency is especially beneficial when producing large batches of custom parts.

Overview of CNC Machining Techniques Used in the Process

  • CNC Milling:

CNC milling is a predominant technique in bicycle component manufacturing. It involves an automated process where rotary cutting tools shape the workpiece. This method is especially effective with materials like 6061 aluminum alloys commonly used for bicycle frame extrusion tubes. The precision of CNC milling ensures that each part meets the desired specifications with exactitude.

  • CNC Turning:

CNC turning is a key subtractive manufacturing process. It differs from the milling operation. In CNC turning, a fixed workpiece undergoes material removal by a single-point cutting tool. This method excels in crafting custom bike parts. The process works well with materials like aluminum, titanium, and steel. Bike parts such as sprockets, chain tensioners, and seat clamps are generally made using this process. The technique ensures precision and efficiency in producing these components.

Rally Precision stands at the forefront of custom CNC bike component production. Our skills in CNC milling and turning showcase the advancement in bike part fabrication. We embrace cutting-edge techniques, setting industry standards. Our approach is direct and results-oriented, ensuring precision in every product.

2. The Design Process of CNC Bike Parts

  • Conceptualizing and CAD Modeling

The journey of creating bespoke CNC bike parts begins with conceptualization. This stage involves transforming ideas into tangible designs. CAD (Computer-Aided Design) software plays a crucial role here. It allows designers to create detailed 3D models of bicycle parts.

These models are not just visual representations; they embody precise dimensions and physical characteristics. CAD modeling serves as the blueprint for the CNC machining process, ensuring each component's design aligns perfectly with its intended function.

  • Material Selection and Machining

In CNC bike parts production, material selection is crucial. The selected material significantly affects part performance, weight, and durability. Aluminum is a common choice due to its light weight nature and strength. Titanium stands out for unmatched durability. Carbon fiber offers exceptional stiffness-to-weight ratio. Steel is known for its robustness. Each material brings distinct benefits to bicycle components.

Different materials require unique machining parameters. CNC machines excel in handling these materials, skillfully shaping them into desired components. Their precision enables the creation of intricate designs. This meets the diverse requirements of cyclists effectively.

  • Finishing and Inspection

In the design process, the final steps are finishing and inspection. CNC machines create components that then receive various finishes. These finishes include anodizing to resist corrosion, polishing for smoothness, and painting to enhance appearance. These finishing techniques not only improve the look but also boost the component's durability and performance.

Quality inspection holds utmost importance. Each component undergoes strict testing for quality and precision. The inspection includes dimension checks, material property assessment, and functionality verification. Components only proceed to assembly or distribution after passing these rigorous tests.

CNC Bike Parts Inspection

3. Material Selection in CNC Bike Parts Manufacturing


Commonly Used Materials

Material selection is crucial in CNC bike parts manufacturing. Common choices are aluminum, steel, titanium, and carbon fiber. Each brings distinct properties. These influence the performance and quality of the final bicycle part.

  1. Aluminum: In bicycle manufacturing, 6061 and 7005 alloys are key materials. Their lightweight and corrosion resistance make them popular. These alloys also excel in shock absorption. Their malleability is a major advantage. This feature allows easy shaping into various forms. As a result, they are ideal for constructing racing bicycle frames and tubes.
  2. Steel: Steel, particularly the American SAE 4130 grade, stands out for its robustness. This material excels in adaptability and moldability. It enables superior design possibilities. Despite its strengths, steel has drawbacks. It is heavier than aluminum. It also shows less corrosion resistance. These factors are crucial in material selection.
  3. Titanium: Titanium stands out for its durability and longevity. This material is light, similar to aluminum, yet offers a distinct handling experience. It finds application in high-end bicycle components like pedals and frames. However, its complex machining and welding processes elevate the cost.
  4. Carbon Fiber: Carbon fiber differs from other metals in its composition and properties. This material is a fabric enhanced with resin. It excels in shock absorption. This makes it ideal for customizing bike parts.

Impact of Material on Performance and Durability

Material selection significantly influences bicycle performance and longevity. Aluminum provides a balance between lightness and strength. This makes it suitable for racing bikes. On the other hand, steel is heavier but offers durability and a classic feel. It is ideal for every day or touring bikes.

Titanium stands out in the high-end bike industry. It merges durability with quality, making it ideal for premium, long-lasting bicycles. Carbon fiber shines in the performance bike segment. Its lightweight nature and adaptability suit bikes where every gram counts. This material ensures optimal riding dynamics.




Shock Absorption





















Carbon Fiber

Very Light





Table 1. Material Properties Table

Material Selection in CNC Bike Parts Manufacturing

4. Key Components in CNC Bike Manufacturing

  • Bike Stems:

Manufacturing Operation: CNC milling is a preferred technique in manufacturing bike stems. This method ensures precise shaping and drilling.

Suitable Material: Aluminum alloys 6061 and 7075 are top choices for manufacturing bike stems. These materials provide the necessary strength. They also ensure fatigue resistance.

  • Cranks and Chainrings:

Manufacturing Operation: CNC turning and milling play a crucial role in manufacturing cranks and chainrings. This process ensures accurate dimensions and intricate detailing. The technology excels in delivering precision.

Suitable Material: 7075 Aluminum is used for these parts, providing the necessary strength and durability for these critical power-transfer components.

  • Thru Axles:

Manufacturing Operation: CNC turning excels in manufacturing thru axles. This method ensures precise diameter control and accurate threading. It's a direct approach to achieving exact specifications in axle production.

Suitable Material: Aluminum 7075 stands out as the preferred material in wheel assembly applications. Its notable strength, coupled with lightweight characteristics, enhances both stability and efficiency.

  • Bike Bashguard

Manufacturing Operation: CNC milling is utilized for bike bashguards, enabling detailed shaping and contouring of this protective component.

Suitable Material: Aluminum 7075 is preferred for its balance of strength and lightness, protecting the chainring from impacts while not adding excessive weight.

  • Other Essential CNC Bicycle Spare Parts

1.    Positive and Negative Disc-Brake:

Operation: CNC milling ensures the precision necessary for the intricate features of disc-brake components.

Material: High-grade aluminum alloys are used, offering the required strength and heat dissipation properties.

2.    Bicycle Tightening Disc:

Operation: A combination of CNC turning and milling is used for detailed shaping and threading.

Material: Aluminum alloys, known for their strength and corrosion resistance, are chosen for these components.

3.    Bicycle Seat Clamps:

Operation: CNC milling is ideal for creating seat clamps with accurate dimensions and smooth finishes.

Material: Both aluminum 6061 and 7075 are used, ensuring clamps are strong yet lightweight.

Related: Understanding the Key Differences: 6061 vs 7075 Aluminum

35mm bike stem Machined Parts Manufacturer
Oval Bike Chainrings-Custom Bicycle Parts
bike crank with CNC machining
CNC Machining 30-32T Bike Bashguard

5. Considerations for Bike Parts Machining

In CNC machining of bike components, careful planning is essential to ensure quality and efficiency. Here are key considerations to optimize the process:

·       Wall Thickness:

When designing custom bike parts, it's crucial to consider the wall thickness. Thin walls, often complex to fabricate, can lead to distortions due to the vibrations of CNC machines. A minimum thickness of 0.8mm for metal and 1.5mm for plastic parts is advisable to avoid these issues and additional production costs.

·       Cavity Depth:

The depth of cavities in parts should align with the capabilities of the CNC cutting tools. Typically, end mills are most effective, up to 2-3 times their diameter. To ensure cost-effectiveness and quality, limiting cavity depth to four times the tool's diameter is recommended. Deeper cavities are possible but require more complex and expensive multi-axis CNC systems.

·       Simplifying Complex Parts:

For intricate parts, especially those with deep pockets, consider breaking down the design into simpler segments. This approach reduces the time and material needed for machining, thereby lowering production costs. After machining, these simpler parts can be assembled to form the final complex component.

Manufacturers can improve the CNC machining of bicycle parts by following these guidelines. The focus should be on enhancing both efficiency and quality. In this specialized area, the key lies in maintaining a balance. This balance involves technical precision and cost management.

6. Quality Control and Testing in CNC Manufacturing


Quality Control:

Quality control and testing are critical in CNC manufacturing to ensure products meet customer specifications and quality standards. The process involves several key steps:

  • Effective Customer Communication: Prompt and clear communication with customers is essential. It starts from understanding their requirements and providing quick quotations to adjusting solutions based on feedback.
  • Understanding Product Design: Engineers meticulously review customer CAD drawings. This process verifies design alignment with specifications. It also assesses CNC machining feasibility. The goal is clear. Achieve cost-efficiency without compromising quality.
  • Product and Service Monitoring: Precision processed products undergo rigorous monitoring. This includes adherence to specifications defined in drawings, production routers, procurement documents, and inspection procedures.
  • Verification of Purchased Products: Received products are visually inspected for quality control. Certain products undergo more detailed inspections as per technical quality control protocols.
  • Process Inspection: Quality assurance is integral in manufacturing. The process begins with the first article inspection, followed by operator inspection. This approach ensures each manufacturing stage maintains high standards.
  • Final Inspection: Completed CNC products undergo a final quality control inspection. This includes confirming the completion of all in-process inspections and performing final checks to ensure compliance with standards. Successful products are then prepared for packaging and shipping.


In addition to these steps, specific techniques and tools are used for quality assurance:

  • Coordinate Measuring Machines (CMM): These devices accurately capture physical object dimensions. They ensure machined parts meet precise specifications. This process guarantees exactness in manufacturing.
  • Optical Comparators: Used for visual comparison of parts against standards, these tools magnify part silhouettes for detailed examination.
  • Surface Profilometers: These measure surface roughness, providing quantitative data on surface textures to meet finishing standards.
  • Hardness Testers: These instruments assess a material's resistance to deformation, like scratching or denting, confirming the strength and durability of machined parts.

By employing these methods, CNC manufacturing ensures the highest quality in its finished products.

Inspection of wavegudie flange

7. Suitable Surface Finishes for CNC Machined Bike Parts

Selecting the right surface finish for CNC machined bike parts is crucial for both aesthetic and functional purposes. Here's a look at some suitable finishes:


  • General Process: This involves immersing the part in an electrolyte solution to form a protective oxide layer.
  • Color Anodizing: Adds a colorful layer, enhancing visual appeal.
  • Black Anodizing: Offers a sleek, uniform black finish, popular for its visual and protective qualities.


This process smoothens the surface of the bike parts, giving them a glossy and reflective finish. It's ideal for parts where a shiny appearance is desired.

Powder Coating:

Powder coating involves applying a dry, powdered paint onto the part. It results in a durable finish, resistant to scratches and chips. This technique is valued for its long-lasting and robust finish.

Bead Blasting:

Bead blasting uses glass or ceramic beads to create a uniform, matte surface on CNC machined parts. It's effective in removing surface imperfections and is often used for parts requiring a non-reflective finish.

Each of these finishes offers unique benefits. Anodizing, available in various colors, provides corrosion resistance and enhanced appearance. Polishing is best for parts requiring a high-gloss finish. Powder coating is ideal for a durable, wear-resistant surface, and bead blasting is suitable for a consistent, matte appearance.

Related: Guide to Surface Treatments For Aluminum Parts

Surface Finishes for CNC Machined Bike Parts


CNC technology plays a pivotal role in revolutionizing bicycle manufacturing. Its precision and versatility enable the creation of custom bike parts that enhance cycling performance and experience. The use of CNC machining not only ensures high-quality, durable components but also allows for innovative designs that cater to specific cycling needs.

Embracing custom CNC bike parts is a step towards an optimized cycling experience. These parts offer a blend of strength, precision, and customization that standard components can't match. Whether it's for professional racing or everyday commuting, CNC machined parts ensure reliability and performance enhancement.

Rally Precision is at the forefront of this technological advancement, providing top-tier CNC solutions for your cycling needs. Explore our range of custom CNC bike parts. Experience the difference in your ride with Rally Precision – where precision meets performance. Contact us for high-quality CNC bike parts.

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