CNC Machined Bicycle Crankset and Hub Components
These are CNC machined bicycle drivetrain components, including crank spiders, chainring bolts, hub shells, axles and bearing spacers. Hub shells and axles are turned, while spiders and crank parts are milled from 6061-T6 or 7075-T6 aluminum and 303 or 304 stainless steel. They are made for bicycle brands, component designers and repair specialists ordering prototypes or production batches.
- Material
- Aluminum
- Tolerance
- to ±0.005 mm
- MOQ
- 1 piece
- Prototype lead time
- 3–7 days
- Hub bearing bores and flanges turned in one setup
- 7075-T6 crank spiders, 6061-T6 hub shells
- Thread gauges for BSA and chainring bolt threads
- Anodized colors with laser-engraved logos
Item ref. 1601682793644 ·
| Process | CNC turning, 3- and 5-axis CNC milling, drilling and tapping |
|---|---|
| Materials | Aluminum 6061-T6, 7075-T6; stainless steel 303, 304 |
| Tolerance | ±0.05 mm standard; down to ±0.005 mm on critical features |
| Surface Finish | Type II anodizing, laser engraving, passivation, polishing |
| Critical Features | Bearing bores, runout, BB and bolt threads |
| MOQ | 1 piece; prototypes through mid-volume |
| Drawing Formats | STEP, IGES, X_T, STL, DWG, DXF, PDF |
| Lead Time | Prototypes typically 3–7 working days; production 10–20 |
| Inspection | First-article, in-process and CMM checks; reports on request |
Manufacturing
How we make this part
Process, material options and inspection for cnc machined bicycle crankset and hub components.
Hubs and cranks are rotating parts, so concentricity and bearing fits come first. Hub shells are turned on CNC lathes with bearing bores and flange faces finished in one chucking, then flange holes and spoke-head pockets are milled. Crank spiders and arms are milled on 3- and 5-axis machines, where the 5-axis step allows pockets and tapered profiles in one setup.
7075-T6 aluminum is preferred for crank spiders and chainrings because of its strength-to-weight ratio, while 6061-T6 is common for hub shells and spacers. Axles and small bolts are often 303 or 304 stainless steel or heat-treatable alloy steel. Anodizing gives color and wear protection on aluminum, typically with laser-engraved logos; stainless parts are passivated or polished.
Bearing bore diameters and runout are checked with bore gauges and on a CMM; press-fit bores have tight tolerance bands that directly affect bearing life. Threads such as BSA bottom-bracket or chainring bolt threads are verified with thread gauges. Typical applications include MTB and road hubs, single-speed and BMX cranks, e-bike drive components and boutique bicycle upgrades.
FAQ
Frequently asked questions
What bearing bore tolerance do you use for bicycle hubs?
We follow the bearing manufacturer's recommended housing fit on your drawing, typically a light press fit. Bore tolerances on these features are held down to about ±0.005 mm on critical diameters, and each bore is checked with a bore gauge before shipment to protect bearing life.
Can you produce cranks and hubs in matching anodized colors?
Yes. Parts that need to match are anodized together in the same batch from the same alloy, which minimizes color variation. Note that 7075 and 6061 can take dye slightly differently, so we recommend approving a color sample for each alloy before production.
How do I get a quote for cnc machined bicycle crankset and hub components?
Send a 3D model (STEP or IGES) and a 2D drawing with tolerances, material, finish and quantity through the quote form or by email. An engineer replies within 24 hours on business days with price, lead time and any DFM suggestions.
Request a quote
Quote this part
Attach drawings or send several parts at once from the full quote form.
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- Phone+86 176 2154 1688
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