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🚗 Auto Parts · Guangzhou, China

Auto parts suppliers verified on site
— not just on Alibaba.

Guangzhou is the world's largest auto parts hub — and also its most counterfeited. Wattage inflation, chipset swaps, and fake certifications are standard practice. We go to the factory so you don't have to guess what you're actually buying.

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Real Case · How We Work
How we verified the correct offset (ET 54.1)
for OEM wheels on a BYD Seagull

A Latin American buyer needed OEM wheels for the BYD Seagull — with a specific ET 54.1 offset. What looked like a simple order revealed a chain of technical decisions that are almost impossible to validate from abroad without someone on the ground.

BYD Seagull OEM wheel rim and tire — offset ET 54.1 verified on site
Automotive hub cap kit — sourced and verified from Guangzhou factory

Verified sample: BYD Seagull wheel + tire (ET 54.1) — and a hub cap kit, delivered complete before deposit.

Step 1 — The spec that changed everything

Offset ET 54.1 — not negotiable

If the wheel arrives with a different offset, the installer is forced to use a spacer. That's not cosmetic: it affects suspension geometry, cornering behavior, and can cause uneven tire wear at highway speed.

Step 2 — Supplier evaluation

Four factories, only one with evidence

We contacted four wheel manufacturers. Most confirmed the offset "by word," with no way to verify it before shipment. Only one factory in Sichuan agreed to document the real specification before the client committed to the order.

Step 3 — Verification before deposit

Installation video + real spec sheet

We coordinated with the factory to get a video of the wheel installed on the vehicle without a spacer, plus a spec sheet with real manufacturing data — not a generic catalog page.

Step 4 — Complete sample

Full set, exactly as the end customer would receive it

We ordered wheel + tire + lug wrench + hydraulic jack + storage bag. The client confirmed in person that it matched the exact specification before committing to any larger order.

The result: From one sample to recurring orders. This is the type of verification we offer across every auto parts category — not just finding a manufacturer, but confirming with real evidence that the part matches your customer's exact vehicle specification.

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Deep Dive
BYD Seagull OEM Wheel
Manufacturing Guide
"I need a BYD Seagull wheel supplier in China" is one of the most common messages we get from Latin American buyers building out an NEV parts catalog.It's also one of the easiest categories to get burned in — the Seagull's specific bolt pattern and offset get quietly substituted more often than buyers expect.

The BYD Seagull is now common enough on Latin American roads that OEM-compatible wheel demand has followed it — but "OEM-compatible" only means something if the factory actually holds to the real specification. Here's what we check before we tell a client a supplier is legitimate.

BYD Seagull (2023–) Wheel Specifications
Bolt pattern (PCD)4 × 100 mm
Center bore diameter54.1 mm
Thread pitchM12 × 1.5
Factory size — standard5.5J × 15", ET40
Factory size — alternative6J × 16", ET40
Acceptable offset (ET) rangeET38 – ET42
Lug nut seat typeConical, 60°
Wheel bolt torque110 Nm

Data verified against independent fitment references, 2026. Wheels with a bore larger than 54.1 mm require a centering ring — a detail aftermarket suppliers frequently skip.

OEM Wheel Production Process

A real OEM-line wheel goes through low-pressure casting or forging, CNC machining of the bolt circle and hub bore, static and dynamic balancing, then a multi-stage coating (primer, base, clear) before final inspection. Factories that skip CNC finishing on the bore tolerance are the ones that ship a wheel that "almost" centers — and almost is what causes vibration at highway speed.

Aluminum Alloy Material

Standard OEM-compatible wheels use A356 or A357 aluminum alloy, heat-treated (T6) after casting to reach the strength needed for a passenger vehicle. We ask every factory for the mill certificate on the aluminum ingot batch — not the finished-wheel spec sheet, which tells you nothing about what alloy actually went into the mold.

Forged vs. Cast Wheels

Cast wheels (gravity or low-pressure) are the standard for OEM-compatible Seagull fitments and the right choice for most buyers on cost. Forged wheels cost 2–4× more but weigh less and resist cracking under impact — worth it for a premium aftermarket line, overkill for a standard replacement-parts catalog.

Quality Inspection

Beyond the visual check, a real inspection includes an air leak test (wheels for tubeless tires must hold pressure), a radial/lateral runout check (excess runout causes steering vibration), and a salt-spray test on the coating — the single most relevant test for Latin America's coastal humidity and intense UV exposure, both of which accelerate clear-coat failure and corrosion on a wheel that looked fine in the factory photos.

MOQ and Customization

Most Guangzhou-area wheel factories quote an MOQ of 100–200 units per size/finish for a private-label or custom-offset run; some accept 50 units at a price premium. Custom finishes (gunmetal, machined-face, bronze) typically add 5–10 days to lead time. Any factory quoting a Seagull-fitment custom wheel at under 50 units with no premium is usually reselling stock they already have in a warehouse — not manufacturing to your spec.

How to Import BYD Seagull Wheels from China

Wheels ship as general cargo (not hazardous), palletized or crated, typically 4 wheels per box for 15–16" sizes. HS code 8708.70 (road wheels and parts) applies for most OEM-compatible fitments — confirm classification with your customs broker before booking, since duty treatment varies by destination country. Sea freight (FCL/LCL) is standard; air freight is only worth it for urgent low-volume orders given the weight-to-value ratio of wheels.

Mexico-specific note: Wheel rims sold in Mexico for automobiles and light trucks (sizes 13–24") fall under the scope of PROY-NOM-150-SCFI-2002, which specifies fatigue-test cycle minimums (30,000 cycles for Type 1 rims, 120,000 for Types 2–4). It's a proposed standard rather than a fully enforced NOM, but it's the closest thing to an official technical benchmark for rim safety in the Mexican market, and it's the kind of document we ask a factory to test against when a client's end destination is Mexico. Source: PROY-NOM-150-SCFI-2002, published via DOF.

Factory Audit Checklist — What We Verify On Site

  • Business license matches the name on the contract and bank account
  • CNC machining line present for bore/bolt-circle finishing — not just a casting shop
  • Mill certificate for the aluminum or steel batch, not just a wheel spec sheet
  • Balancing and air-leak test stations on the actual production floor
  • Sample wheel installed on a real Seagull (or matching hub jig) with no spacer
  • Export history — prior shipments to Latin America or other humid/coastal markets
  • Packaging method suited for ocean freight, not just domestic distribution
What We Cover
Auto parts we verify
and source

We work with buyers sourcing automotive accessories, OEM-compatible parts, and private-label products from Guangzhou. Our team verifies which factories actually manufacture and which ones repackage.

Accessories & Private-Label

We also verify and source automotive accessories and custom interior products — including private-label packaging support for DTC and retail brands.

Custom Car Air FreshenersCustom-scented car diffusers and vent clips — private-label packaging, fragrance selection, and bulk sourcing available.
Car Decals & Interior StickersVinyl decals, dashboard and interior stickers — custom sizing, printing, and adhesive types sourced to your design.
Seat Covers & Leather AccessoriesUniversal and model-specific seat covers, leather trim and accessories — material grade and stitching verified before shipment.
LED Ambient Interior LightingLED ambient light strips and kits — color, brightness, and app/control compatibility confirmed with the manufacturer.
Scented Air Vent & Headlight DiffusersFragrance diffusers designed for vents and light housings — compact formats for private-label retail.
Scented Wheel Hub CapsFragrance-infused wheel hub caps — a niche accessory category we can source and verify for private-label sellers.
Ready to Verify?

Tell us your supplier.
We'll go check it out.

Share an Alibaba link, company name, or contact details. We visit within 48–72 hours and deliver a full video report — factory floor, production lines, real certifications, and unedited walkthroughs.

Factory Verification — $349
Pre-Shipment Inspection — $299/man-day
Factory Audit — $399/man-day
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What you get:

Unedited video walkthrough of the factory floor · Business license verification · Physical certification checks (DOT, ECE, ISO) · Real production capacity · Written report with findings · Delivered in 48 hours

No visit fee if we can't confirm it's a real manufacturer.