--- title: "Custom Bike Parts & CNC Bicycle Components | OpenSpindle" description: "Custom bike parts from one prototype to production: CNC chainrings, derailleur hangers, stems, hub parts, and 3D printed mounts. Built by bike racers. Send your CAD." canonical: https://openspindle.com/industries/cycling-bike-parts updated: 2026-09-27 --- # Custom bike parts, components, and prototypes From one-off prototypes to small production runs, OpenSpindle helps cycling companies, framebuilders, teams, and product designers source custom bike parts. Send your CAD, drawings, BOM, or even just the part you're trying to make. We'll review the requirements and source qualified manufacturing partners for the job. **Certifications:** Built by bike racers, One part or 1,000, Prototype to production **Minimum order:** 1 part | **Core materials:** 7075 aluminum, titanium, carbon | **Processes:** CNC, 3D printing, carbon, sheet | **Run size:** Prototype to production ## We race bikes. We know bikes. OpenSpindle co-founders Tom Petrini and Bryan Petro are avid cyclists, and we both race: criteriums, road races, gravel races, and cyclocross. Bikes are how we spend our weekends and a good part of our weekdays. That changes how we read your project. We know why a derailleur hanger is supposed to bend before the frame does, why a stem clamp that creaks gets noticed on the first climb, and why a computer mount that rattles loose on a gravel descent needs a better design. When you send us a bike part, we look at it the way riders do, then find the manufacturing partner set up to make it. ## Bike parts we can source ### Drivetrain & powertrain - Chainrings - Spider components - Crank arms - Crank spacers - Bottom bracket components - Derailleur hangers - Rear derailleur components - Front derailleur components - Cassette components - Freehub components - Axles - Lockrings - Chain guides - Chain catchers - Bash guards - Pulley cages - Shift cable guides - Cable stops - Custom drivetrain hardware **Common materials:** 7075 aluminum, 6061 aluminum, 2024 aluminum, stainless steel, titanium, carbon fiber, Delrin/POM, engineering plastics. ### Frame & suspension components - Replaceable dropout inserts - Custom dropouts - Frame inserts - Frame plugs - Cable ports - Internal cable guides - Cable routing components - Brake mounts - Bottle cage mounts - Rack mounts - Fender mounts - Suspension linkage components - Shock mounts - Pivot hardware - Bearing spacers - Suspension spacers - Axle hardware **Common materials:** 6061/7075 aluminum, titanium, stainless steel, 4130 chromoly steel, carbon fiber, Delrin/POM, nylon. ### Cockpit components - Custom stems - Stem components - Stem spacers - Custom headset spacers - Headset components - Handlebar clamps - Handlebar mounts - Computer mounts - Computer mount adapters - Aero extensions - Aerobar hardware - Bar-end plugs - Accessory mounts - Cable routing hardware **Common materials:** 6061/7075 aluminum, carbon fiber, stainless steel, titanium, Delrin/POM, nylon, TPU. ### Wheels & hub components - Hub shells - Custom hub components - Freehub bodies - Axle spacers - End caps - Thru-axles - Hub adapters - Bearing spacers - Rotor lockrings - Custom spoke components - Rim inserts - Valve components - Wheel sensor mounts - Wheel hardware **Common materials:** 6061/7075 aluminum, titanium, stainless steel, carbon fiber, Delrin/POM. ### Braking components - Brake adapters - Caliper mounts - Rotor adapters - Brake lever components - Brake spacers - Pad retainers - Cable guides - Heat-management components - Custom brake hardware **Common materials:** 6061/7075 aluminum, stainless steel, titanium, carbon fiber, engineering plastics. ### Bike mounts & accessories A lot of custom work in cycling happens here, and much of it starts as a 3D print before it moves to machined aluminum or molded parts. - GPS mounts - Computer mounts - Phone mounts - Camera mounts - Action-camera adapters - Light mounts - Radar mounts - Aero sensor mounts - Battery mounts - Electronic accessory mounts - Bottle cage adapters - Saddle bag mounts - Tool mounts - Pump mounts - Custom team mounts - Custom brackets - Protective covers - Custom enclosures - Equipment cases - Prototype accessories **Common materials:** SLS and MJF nylon, FDM and SLA prints, CNC-machined aluminum, sheet metal, laser-cut plate, and carbon fiber. ### Bikepacking & adventure components - Rack mounts - Rack brackets - Pannier hardware - Cargo mounts - Cargo brackets - Fork cargo mounts - Anything cages - Frame bag hardware - Bottle cage adapters - Frame protection components - Tool mounts - Accessory brackets - Custom hardware **Common materials:** 6061 aluminum, stainless steel, titanium, 4130 chromoly, UHMW, TPU, and nylon. ### Aero & performance components A strong fit for cycling product startups and teams developing new equipment, where the first version is a prototype headed for the wind tunnel or the road. - Aero fairings - Aero covers - Wheel covers - Hydration mounts - Bottle cage components - Computer mounts - Aero extensions - Sensor mounts - Wind-tunnel prototypes - TT/triathlon accessories - Custom aerodynamic components **Common materials:** Carbon fiber, SLS nylon, SLA resin, 6061/7075 aluminum, and polycarbonate. ## Certifications Most custom bike parts are made to your drawing, and the checks that matter are fit, material, and finish. For safety-critical parts, testing to the relevant bicycle standard is the brand's responsibility, usually through an accredited test lab, so plan for it early. - **Material certifications:** Ask for mill certs when alloy and temper matter, such as 7075-T6 for chainrings and stems or Grade 5 titanium for axles and bolts. It confirms you received the material you designed around. - **ISO 4210 and 16 CFR 1512:** ISO 4210 sets safety requirements and test methods for bicycles and key components such as frames, forks, handlebars, and stems. 16 CFR 1512 is the US CPSC bicycle regulation. Relevant when you sell complete bikes or safety-critical parts. - **EN 15194 for e-bikes:** The European standard for electrically power assisted cycles. It applies to complete e-bikes, so it matters for battery mounts, motor brackets, and enclosures that are part of a certified bike. - **First article inspection:** For production runs, ask for a first article report before the full batch ships. It is the cheapest way to catch a wrong thread, bore, or interface before you have 500 of them. ## Capabilities for This Industry - [CNC Machining](https://openspindle.com/capabilities/cnc-machining.md) -- 3- and 4-axis milling for hangers, chainrings, mounts, brackets, and spacers in aluminum, titanium, steel, and plastics. - [5-Axis Machining](https://openspindle.com/capabilities/5-axis-machining.md) -- Stems, crank arms, suspension linkages, and hub shells with complex, organic geometry in one setup. - [CNC Turning](https://openspindle.com/capabilities/cnc-turning.md) -- Thru-axles, hub and freehub components, spacers, lockrings, and pivot hardware. - [Swiss Machining](https://openspindle.com/capabilities/swiss-machining.md) -- Small, precise turned parts in volume: pivot bolts, valve components, and bearing spacers. - [Carbon Fiber Cutting](https://openspindle.com/carbon-fiber-cutting.md) -- CNC-routed carbon plate for chain guides, brackets, covers, and aero parts in T300, T700, and T800. - [SLS 3D Printing](https://openspindle.com/capabilities/sls-3d-printing.md) -- Nylon 12, Nylon 11, glass-filled, and carbon-filled nylon for strong computer, light, and sensor mounts. - [FDM 3D Printing](https://openspindle.com/capabilities/fdm-3d-printing.md) -- PETG, ABS, ASA, nylon, carbon-filled polymers, and TPU for fit checks, covers, and low-volume accessories. - [Resin 3D Printing](https://openspindle.com/capabilities/resin-3d-printing.md) -- SLA for high-detail prototypes, small components, enclosures, and fit-check parts. - [Sheet Metal Fabrication](https://openspindle.com/capabilities/sheet-metal-fabrication.md) -- Brackets, mounting plates, guards, tabs, and bikepacking hardware in aluminum, stainless, steel, and titanium. - [Laser Cutting](https://openspindle.com/capabilities/laser-cutting.md) -- Flat blanks and prototype frame components, cut fast from sheet before forming or machining. - [Anodizing](https://openspindle.com/capabilities/anodizing.md) -- Type II color anodize for cockpit and cosmetic parts, Type III hard anodize for chainrings and wear surfaces. - [Powder Coating](https://openspindle.com/capabilities/powder-coating.md) -- Durable color for steel frames, racks, and cargo hardware. ## Common Materials - [Aluminum](https://openspindle.com/materials/aluminum.md) -- 6061-T6, 7075-T6, 2024, 6063, and 5052. 7075 for chainrings and stems, 6061 for mounts and brackets. - [Titanium](https://openspindle.com/materials/titanium.md) -- Grade 5 (Ti-6Al-4V) for axles, bolts, and dropouts; Grade 2 where formability matters more than strength. - [Carbon Fiber](https://openspindle.com/materials/carbon-fiber.md) -- T300, T700, T800, 3K woven, unidirectional, and prepreg for plates, covers, and aero parts. - [Alloy Steel](https://openspindle.com/materials/alloy-steel.md) -- 4130 chromoly for framebuilding parts and dropouts, 4140 for high-strength hardware. - [Stainless Steel](https://openspindle.com/materials/stainless-steel.md) -- 304, 316, and 17-4 PH for hardware, rack parts, and corrosion-exposed components. - [Carbon Steel](https://openspindle.com/materials/carbon-steel.md) -- 1018 and mild steel for fixtures, brackets, and budget prototype parts. - [Delrin](https://openspindle.com/materials/delrin.md) -- Acetal (POM) for low-friction spacers, bushings, chain guides, and cable guides. - [Nylon](https://openspindle.com/materials/nylon.md) -- PA12 and filled nylons for printed mounts and impact-tolerant accessories. - [PEEK](https://openspindle.com/materials/peek.md) -- High-performance plastic for bushings and parts near heat, such as brake-adjacent components. - [Polycarbonate](https://openspindle.com/materials/polycarbonate.md) -- Tough, clear covers and aero prototypes. - [G10 / FR4](https://openspindle.com/materials/g10-fr4.md) -- Glass-epoxy laminate for plates, guards, and insulating mounts. - [ABS](https://openspindle.com/materials/abs.md) -- Printed and machined enclosures, covers, and prototype accessories. ## Bike parts: typical materials, processes, and finishes A starting point for common custom bike components. Confirm alloy, temper, and finish against your loads and the part you are replacing. | Part | Typical material | Process | Common finish | | --- | --- | --- | --- | | Chainrings | 7075-T6 aluminum; steel for high-wear use | CNC milling | Hard anodize or color anodize | | Derailleur hangers | 6061-T6 or 7075-T6 aluminum | CNC milling from plate | Anodize | | Thru-axles | 7075 aluminum, Grade 5 titanium, or steel | CNC turning | Anodize; titanium left raw or polished | | Stems | 6061/7075 aluminum or titanium | 3- to 5-axis CNC machining | Anodize or bead blast | | Headset and stem spacers | 6061 aluminum, carbon fiber, Delrin | CNC turning | Anodize | | Computer, light, and GPS mounts | 6061 aluminum or PA12 nylon | CNC machining or SLS/MJF printing | Anodize or dyed black | | Dropouts | 4130 chromoly, 6061/7075 aluminum, Grade 5 titanium, stainless | CNC machining, laser or waterjet cutting | Raw for brazing or welding; finished with the frame | | Suspension linkages and pivots | 7075-T6 aluminum, titanium or steel hardware | 5-axis machining and turning | Anodize | | Chain guides and bash guards | Carbon fiber, UHMW, Delrin, 7075 aluminum | CNC routing or machining | Raw, anodize, or clear coat | | Aero fairings and covers | Carbon fiber, SLS nylon, SLA resin | Composite layup, routing, or 3D printing | Paint, clear coat, or raw | ## Bike standards to call out on your drawing Bikes run on interface standards. Naming the standard your part must mate with saves a round of questions and a wrong first article. | Interface | Common standards | What to specify | | --- | --- | --- | | Thru-axles | 12x100 and 12x142 mm (road), 15x110 and 12x148 mm Boost (mountain) | Axle length, thread pitch (M12x1.5 is common but not universal), and head style | | Bottom brackets | BSA threaded (1.37 in x 24 TPI), T47 (M47x1), press-fit shells | Shell standard and width; BSA drive-side cups use a left-hand thread | | Chainrings | 110 mm BCD (road), 104 mm BCD (mountain), brand direct-mount interfaces | BCD or direct-mount standard, tooth count, and narrow-wide profile if 1x | | Rotors | 6-bolt (44 mm bolt circle) and Center Lock | Rotor interface and rotor size for adapters and spacers | | Brake mounts | Flat mount (road and gravel), post mount (mountain) | Mount standard, rotor size, and caliper model | | Cockpit | 1-1/8 in (28.6 mm) steerer; 31.8 mm and 35 mm bar clamps | Steerer and bar clamp diameters, clamp width, and bolt torque | | Derailleur hangers | Frame-specific hangers, SRAM UDH | Frame make, model, and year, or the original hanger to measure | | Bottle and accessory bosses | M5 threads, 64 mm bottle cage spacing | Boss spacing, thread, and clearance to the frame | ## Finishes for bike parts Finish is part of the spec on cycling parts. Call it out on the drawing along with any areas that must stay masked. | Finish | Best for | Note | | --- | --- | --- | | Anodizing (Type II) | Aluminum cockpit, mounts, and cosmetic parts | Color can vary between batches; order related parts together if they must match | | Hard anodizing (Type III) | Chainrings, wear surfaces, and sliding parts | Adds a hard, wear-resistant layer; mask bearing seats and threads or dimension for coating build | | Cerakote | Colored hardware and cosmetic parts in metal | Thin ceramic coating in many colors | | Powder coating | Steel frames, racks, and cargo hardware | Thicker than anodize; mask threads, bosses, and bearing surfaces | | Bead blasting | Uniform matte look on aluminum, titanium, and stainless | Often done before anodizing for a satin finish | | Brushing and polishing | Titanium and stainless parts | Common on raw titanium parts | | Passivation | Stainless steel hardware | Improves corrosion resistance | | Black oxide | Steel hardware | Mild corrosion resistance; usually oiled | | Heat treatment | 4130, 4140, and 17-4 PH steel parts | Specify the condition or hardness on the drawing | | Laser engraving and part marking | Logos, part numbers, and torque specs | Supply artwork as vector files | ## Why OpenSpindle - **One partner, every process:** A bike part can need CNC machining, 3D printing, carbon cutting, and anodizing on the same order. Send the whole project to OpenSpindle instead of managing multiple machine shops. - **One part or 1,000:** Prototype a new stem or mount, run a small batch for a team, or move a proven part into production. The same manufacturing partner can repeat the run when you need more. - **Send whatever you have:** CAD, a dimensioned drawing, a BOM, a broken part, or a clear description of what you are trying to build. We review the requirements and identify the right process before we source it. - **Riders reviewing your parts:** We race bikes, so we know which interfaces matter, where a part sees load, and which details to confirm before the first article instead of after it. ## Who We Help - **Cycling companies:** Source prototypes and production components without managing multiple machine shops. - **Bike manufacturers:** Source custom components, frame hardware, and low-volume production parts. - **Component startups:** Turn CAD into functional prototypes and production-ready parts. - **Framebuilders:** Source specialized components, dropouts, hangers, mounts, and custom hardware. - **Cycling teams:** Create custom mounts, brackets, equipment, and one-off parts. - **Product designers:** Prototype new cycling products before committing to tooling or large production runs. - **Individual cyclists:** Need a one-off custom component or replacement part? We can help source it. - **Bike shops and service centers:** Replace discontinued or hard-to-find parts for customer bikes. ## Frequently Asked Questions ### Can you make a custom derailleur hanger? Yes. Derailleur hangers are one of the most common custom bike parts. Send the original hanger, a drawing, or a CAD file, plus the frame make, model, and year. Hangers are usually machined from 6061-T6 or 7075-T6 aluminum plate. A hanger is designed to bend or break before the frame does, so match the original material and thickness rather than making it stronger. ### Can you make a custom chainring? Yes. Chainrings are typically CNC machined from 7075-T6 aluminum and anodized, with hard anodize for better wear life. Specify the bolt circle diameter or direct-mount standard, tooth count, chain speed, offset, and whether you want a narrow-wide tooth profile for a 1x drivetrain. ### I need to replace a discontinued bike part. Can you help? Often, yes. Send the original part if you have it, or clear photos with key measurements, and tell us what it mates with. We can have a manufacturing partner reverse engineer it and make one or a small batch. Safety-critical parts such as stems, bars, and crank arms need extra care, so tell us how the part is loaded. ### Are 3D printed bike mounts strong enough? For many accessories, yes. SLS and MJF nylon, including glass-filled and carbon-filled grades, work well for computer, light, radar, and camera mounts, and printing is the fastest way to iterate a design. For mounts that carry high loads or see repeated impacts, a CNC-machined aluminum version is the usual next step once the design is proven. ### Can you make carbon fiber bike parts? Yes. CNC-cut carbon plate is common for chain guides, brackets, covers, and small structural plates. Molded composite parts, such as fairings and custom covers, are also possible and usually need tooling. Tell us the fiber (T300, T700, or T800), weave or unidirectional layup, thickness, and edge finish. ### Do you work with framebuilders? Yes. Framebuilders use OpenSpindle for dropouts, hangers, bottle and rack mounts, cable guides, and custom hardware, often in 4130 chromoly, stainless, titanium, or aluminum. Small batches are normal. Note whether the parts will be brazed or welded so they ship without a finish that gets in the way. ### What do I need to send to get a quote? A STEP file plus a dimensioned PDF drawing is ideal, calling out material, finish, tolerances on bearing seats and threads, and quantity. For flat parts like hangers and chainrings, a DXF works. If you do not have CAD, send photos, measurements, the original part, or a description, and we will work out the next step with you. ### What is the minimum order? One part. Prototypes and one-offs are normal. Expect a setup cost on a single part that drops per unit as quantity goes up, and tell us your target quantity so partners can quote the right process for the volume. ### Do I need to name bike standards on my drawing? Yes, it helps a lot. Name the interface your part mates with: thru-axle size and thread pitch, bottom bracket standard, chainring bolt circle or direct-mount standard, brake mount type, steerer and handlebar clamp diameters. That removes guesswork and a round of questions. ### Does OpenSpindle understand bikes? Yes. Our co-founders, Tom Petrini and Bryan Petro, are avid cyclists who race criteriums, road races, gravel, and cyclocross. We read bike projects the way riders do, then match them with manufacturing partners set up for the work. ### Will you sign an NDA before I share my design? Yes. If you are developing a new product, tell us in your first message and we can put an NDA in place before you share files. ## Sourcing Guides - [Tap drill & thread chart](https://openspindle.com/reference/tap-drill-thread-chart.md) - [Anodizing spec guide](https://openspindle.com/reference/anodizing-spec.md) - [CNC machining tolerance chart](https://openspindle.com/reference/cnc-machining-tolerance-chart.md) - [Surface finishes compared](https://openspindle.com/reference/surface-finishes-compared.md) - [Manufacturing sourcing for startups](https://openspindle.com/compare/manufacturing-sourcing-for-startups.md) - [How to find a machine shop](https://openspindle.com/compare/how-to-find-a-machine-shop.md) ## Related Industries - [Hardware Startups](https://openspindle.com/industries/hardware-startups.md) - [Drones & UAV](https://openspindle.com/industries/drones-uav.md) - [Automotive](https://openspindle.com/industries/automotive.md) - [Robotics & Automation](https://openspindle.com/industries/robotics-automation.md) - [Aerospace & Defense](https://openspindle.com/industries/aerospace-defense.md) - [EV & Battery](https://openspindle.com/industries/ev-battery.md) - [Electronics](https://openspindle.com/industries/electronics.md) - [Medical Devices](https://openspindle.com/industries/medical-devices.md) ## Have a custom bike part to make? Send us the CAD, drawing, BOM, or even a description of what you are trying to build. OpenSpindle reviews the project, identifies the right manufacturing process, and sources qualified manufacturing partners for your parts. One part or 1,000. Prototype or production.