High Precise Machined Base Hub For Biycle

Why Hub Precision Controls The Whole Bicycle

A bicycle frame is only as stiff as the parts that tie it together. The base hub carries the rear derailleur or the disc-brake caliper, and it transfers every watt the rider produces - plus every shock the ground sends back - into the dropouts. A hub that sits a millimetre off-square pulls the cassette out of line and loads the spokes unevenly; a hub that is machined true keeps the drivetrain quiet, the brake rotor centred, and the wheel round for the life of the frame.

That is why this component is cut from 7075-T6 aluminum on a 5-axis CNC platform, and held to ±0.01 mm on the features that touch the rest of the bike. The body is hard anodized so it survives rain, road salt, and a car trunk in summer. Every hub is built to your drawing or your sample, so a frame maker with an existing dropout pattern, a brand launching a new platform, or a component house spec-ing a private-label line gets the part they need instead of the closest catalog item.

SXFD is the default brand on this hub. The same production line is available as an OEM run for your label, with material, surface treatment, logo engraving, and packaging all configurable before tooling is committed.

Specification Highlights

• Body machined from 7075-T6 aluminum as standard - a higher-strength alloy is available on request where the duty cycle justifies it.
• 5-axis CNC platform so undercuts, angled mounting faces, and complex interfaces are cut in a single setup rather than re-fixtured.
• ±0.01 mm tolerance on critical mating features - derailleur mounting faces, brake-mount bosses, axle bores, and dropout-register surfaces.
• Hard anodized surface as standard for wear and corrosion resistance; machined-only finish available where a polished or shot-peened face is specified.
• Hub geometry to drawing - square, rectangular, round, or contoured footprints to suit your dropout or frame interface.
• Sample units available against drawings or supplied samples before tooling or production order is committed.
• Plywood case export packing so hubs arrive clean, dry, and undamaged for container loads.
• Lead time 30–45 days after drawing confirmation; EXW, FOB, CIF shipping by sea, air, train, or express.

Technical Specifications

The table below is the standard specification for the SXFD base-hub line. Material grade, surface finish, and dimensional call-outs are confirmed against your drawing at the quotation stage.

Material Choices And What Each Alloy Buys You

The standard hub body is 7075-T6 aluminum - the same alloy family used in high-end cycling components and aerospace structural parts. It delivers a tensile strength around 572 MPa, yield around 503 MPa, and density of 2.81 g/cm³. In plain terms, it is light enough to ignore on the bike and stiff enough that the derailleur hanger does not flex under sprint load.

For buyers who need a different balance, the same CNC program can run on:

• 6061-T6 - easier to weld, slightly lower strength, useful when the hub is integrated into a welded assembly or a budget-tier frame.
• 6082-T6 - the European equivalent of 6061 with marginally higher strength; common in OEM specs from EU bike brands.
• 7050-T7 - used where fracture toughness matters more than peak tensile, such as aggressive downhill or freeride platforms.

The alloy and temper are called out on the drawing and confirmed in the quotation. Material certificates can be issued per batch on request.

5-Axis Machining And Why The Setup Matters

A base hub is not a flat bracket. The derailleur mounting face sits at one angle, the disc-brake boss at another, the dropout-register surfaces at a third. On a 3-axis machine that geometry has to be produced in two or three setups, and every re-fixture introduces a datum shift the final tolerance budget has to absorb.

The 5-axis platform cuts the body in a single setup. The part stays on the same tombstone from the first cut to the last, so the geometric relationship between the mounting faces, axle bores, and registration surfaces is held by the machine kinematics rather than by an operator lining up a second vise. The practical result is that ±0.01 mm is a working tolerance rather than a heroic one, and hub-to-hub repeatability is tight enough that a complete frame can be assembled without per-part shimming. Secondary operations - deburring, surface finishing, and laser marking of part numbers or brand logos - are handled in-line.

Tolerance And Inspection

Tolerances are verified against your drawing at three stages: first-article inspection on a coordinate measuring machine (CMM) against the full drawing including geometric dimensioning and tolerancing (GD&T) call-outs; in-process inspection at machining checkpoints using plug, thread, and ring gauges plus surface-roughness comparators; and final sampling inspection before packing, with a full report per batch. Typical reports cover critical-feature dimensions, surface roughness readings (Ra where specified), hardness confirmation on the anodized layer, and a visual record. Independent third-party inspection - SGS, BV, or TUV - can be arranged at the buyer's cost when contract terms require it.

Where These Hubs Run

The base-hub line is specified where the frame interface is custom or where the brand does not want a catalog part on its build:

• Mountain bike frames - hardtail and full suspension, where derailleur hanger stiffness and disc-brake alignment are critical under shock load.
• Road and gravel frames - integrated designs where the hub is part of the dropout and disc-brake mount and has to clear tight chainstay packaging.
• E-bike platforms - mid-drive motor mounts and integrated battery frames where hub machining carries electrical isolation requirements.
• BMX, trials, and kids' bikes - small-batch runs where hub geometry is non-standard and a catalog part does not exist.
• Custom frame builders and prototype projects - one-off or low-volume runs where the hub is part of the frame's IP.
• Tandem, recumbent, and adaptive cycles - non-standard layouts that need a custom hub footprint.
• OEM replacement programmes - brands running a legacy hub specification that the original supplier no longer supports.

Customization And OEM

Every hub on this page is a custom run. The starting point is your drawing or your existing sample:

• Geometry - outline, mounting-hole pattern, axle bore, derailleur hanger geometry, disc-brake mount type (post-mount, flat-mount, or proprietary), and integration with dropout or frame features.
• Material - 7075-T6 as standard; 6061, 6082, or 7050 available on request.
• Surface - hard anodized Type III black as standard; clear, dyed colors, or machined-only finishes available.
• Marking - laser-engraved part numbers, batch codes, brand logos, or compliance text.
• Tolerances - ±0.01 mm is the working budget on critical features; tighter call-outs can be held where the design requires it.
• Packaging - individual wrapping, kit assembly with fasteners, retail box, or bulk-packed for OEM lines.

Sample lead time is 10–15 days after drawing confirmation, with samples shipped by express so the design can be approved before production tooling is committed.

Quality Control Flow

 

Every production batch is logged through a controlled flow: incoming material verification against the mill certificate; in-process first-article and interval inspections at the machining checkpoints; final sampling inspection with hardness check on the anodized layer where specified; and full traceability from batch number to machine ID, operator, and inspector. Workmanship is judged against the drawing and any supplied reference samples. Non-conforming parts are quarantined, reworked where possible, or scrapped and replaced before packing.

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Packaging, Lead Time, And Shipping

Hubs are wrapped to prevent surface contact, packed in lots, and shipped in plywood cases suited to container export. Documentation per shipment includes commercial invoice, packing list, material certificate where requested, and inspection report. Lead time is 30–45 days from confirmed order and approved sample, depending on batch size and surface-treatment queue. Standard shipping is by sea for production runs and by air or express for samples and urgent orders; incoterms are EXW, FOB, or CIF as agreed.

Ordering Workflow

The standard order flow on this hub line is: send your drawing or physical sample; we evaluate manufacturability and material suitability; we issue a quotation including alloy, finish, tolerance budget, lead time, and tooling notes; we make sample units against the approved drawing; you test the samples against your frame and drivetrain; feedback on fit, finish, or tolerance is incorporated into the production program; mass production starts against the released drawing; in-process and final inspections run against the inspection plan; hubs are packed, documented, and shipped.

FAQ

Request A Quote

Your drawing (STEP / DWG / PDF) or a physical sample
Annual volume estimate and lot size
Alloy, finish, and color preference
Target tolerance on critical features
Incoterm and destination port
We will respond with a quotation, a lead-time estimate, and a sample plan within two working days.

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