Precision machining for cranksets, pedals, hubs, stems, and suspension parts—complex geometries, tight tolerances, and lightweight designs for high-performance bikes.
Yumei offers 3-axis, 4-axis, and 5-axis CNC milling to meet a wide range of bicycle component manufacturing needs,This multi-axis CNC machining capability allows us to produce precision bicycle parts with tight tolerances, optimized lightweight designs, and superior surface finishes, supporting prototypes, small batches, and mass production.
CNC turning plays a critical role in manufacturing high-precision rotational parts for the bicycle industry.We produce components such as axles, spindles, shafts,crank bolts,chainring bolts and stem bolts with outstanding concentricity and surface finish.
CNC turning is ideal for prototyping, small-batch production, and large-scale manufacturing of cylindrical bike components.
Mill-turn machining provides an integrated solution for producing complex rotational-plus-milled bicycle components in a single setup. This technology is ideal for parts requiring both precision turning and multi-surface milling, such as pedal spindles with wrench flats, hub axles and custom lightweight components.
By combining milling and turning cycles, mill-turn machining improves tolerance stability, geometric accuracy, surface finish, and reduces cycle time—supporting both high-performance bicycle manufacturing and cost-efficient OEM production.
Swiss CNC machining is ideal for producing small, high-precision rotational bicycle components that require ultra-tight tolerances and excellent concentricity. This process is widely used for spoke nipples, valve cores, axle shafts, brake system pins, and lightweight titanium components.
Swiss turning excels in machining long, slender, micro-sized, and complex geometry parts while maintaining micron-level accuracy—perfect for high-performance bicycle assemblies and premium OEM components.
Yumei supplies high-precision bicycle fasteners including crank bolts, chainring bolts and nuts, and stem bolts, manufactured in steel, stainless steel, aluminum, and titanium. Our CNC machining and strict quality control ensure high strength, corrosion resistance, and consistent fitment for OEM and aftermarket bicycle applications.
| Permissible deviations in mm for ranges in nominal lengths | Tolerance class:designation (description) | |||
|---|---|---|---|---|
| f (fine) | m (medium) | c (coarse) | ||
| Linear Dimensions | ||||
| 0.5 up to 3 | ±0.05 | ±0.1 | ±0.2 | |
| over 3 up to 6 | ±0.05 | ±0.1 | ±0.3 | |
| over 6 up to 30 | ±0.1 | ±0.2 | ±0.5 | |
| over 30 up to 120 | ±0.15 | ±0.3 | ±0.8 | |
| over 120 up to 400 | ±0.2 | ±0.5 | ±1.2 | |
| over 400 up to 1000 | ±0.3 | ±0.8 | ±2.0 | |
| over 1000 up to 2000 | ±0.5 | ±1.2 | ±3.0 | |
| over 2000 up to 4000 | - | ±2.0 | ±4.0 | |
| External Radius and Chamfer Heights | ||||
| 0.5 up to 3 | ±0.2 | ±0.2 | ±0.4 | |
| over 3 up to 6 | ±0.5 | ±0.5 | ±1.0 | |
| over 6 | ±1.0 | ±1.0 | ±2.0 | |
| Angular Dimensions | ||||
| up to 10 | ±1º | ±1º | ±1º30' | |
| over 10 up to 50 | ±0º30' | ±0º30' | ±1º | |
| over 50 up to 120 | ±0º20' | ±0º20' | ±0º30' | |
| over 120 up to 400 | ±0º10' | ±0º10' | ±0º15' | |
| over 400 | ±0º5' | ±0º5' | ±0º10' | |
A: Cranksets, hubs, pedals, stems, suspension brake mounts, chainrings, and fasteners like crank bolts,chainring bolts and nuts and stem bolts.
A: Aluminum, stainless steel, carbon steel, titanium, and engineering plastics.
A: ISO 2768-m for metals and ISO 2768-c for plastics
A: Anodizing, hard anodizing, powder coating, electroplating, polishing, and passivation.
A: Yes, we support prototyping, small runs, and mass production for all types of bicycles.
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