Wheel PCD: How to Measure & Select Correctly — Complete Bolt Pattern Guide

⚡ Quick Answer: This guide on wheel PCD how to measure & select correctly explains that PCD (Pitch Circle Diameter) is the diameter of the circle passing through all wheel bolt holes. For even lug counts (4, 6, 8), measure center-to-center between opposite holes. For odd lug counts (5), measure from the center of one hole to the far edge of the second hole, then multiply by 1.051. Common PCD values include 5×112 (VW, Audi, Mercedes), 5×120 (BMW, Holden), 6×139.7 (trucks, SUVs), and 8×200 (commercial vehicles). Always verify PCD, offset, and center bore before purchasing wheels. Incorrect PCD causes vibration, bolt stress, and wheel detachment.

Wheel PCD How to Measure & Select Correctly: What Is PCD?

PCD Definition

PCD (Pitch Circle Diameter) — also called bolt pattern, bolt circle, or lug pattern — is the diameter of the imaginary circle passing through the center of all wheel bolt holes:

• Format: Number of bolts × PCD diameter (e.g., 5×112)

• First number: Number of bolt holes (4, 5, 6, 8, 10)

• Second number: Diameter in millimeters of the bolt circle

• Units: Metric (mm) for most vehicles, Imperial (inches) for some US trucks

💡 Example: 5×112 means 5 bolt holes on a 112mm diameter circle. This is the standard PCD for VW, Audi, Mercedes-Benz, and many European vehicles.

Why PCD Matters

Incorrect PCD causes serious problems:

• ❌ Vibration — Wheel not centered on hub

• ❌ Bolt stress — Bolts cannot seat properly

• ❌ Wheel detachment — Bolts can shear under load

PCD must match exactly — there is no tolerance. A 5×112 wheel will not fit a 5×114.3 hub.

Wheel PCD How to Measure & Select Correctly: Step-by-Step Measurement

Tools You Need

• Vernier caliper — Most accurate (±0.02mm)

• PCD gauge — Specialized tool for bolt pattern measurement

• Tape measure — Less accurate but workable

Measuring Even Lug Patterns (4, 6, 8 Lug)

For even lug counts, measure center-to-center between two opposite bolt holes. The measurement is the PCD diameter.

Example — 4-lug: 4 bolt holes, opposite holes 100mm apart → PCD = 4×100

Example — 6-lug: 6 bolt holes, opposite holes 139.7mm apart → PCD = 6×139.7

Measuring Odd Lug Patterns (5 Lug)

For 5-lug wheels, there is no opposite hole. Use one of these methods:

Method 1: Measure from the center of one bolt hole to the far edge of the second hole. Multiply by 1.051 to get PCD.

Method 2: Measure from the center of one bolt hole to the center of the third hole (skipping one). This gives PCD directly.

Method 3: Use a PCD gauge — place on bolt holes and read the value directly.

Example — 5×112: Center of hole 1 to far edge of hole 2 = 106.6mm → 106.6 × 1.051 = 112mm → PCD = 5×112

Common PCD Bolt Patterns by Vehicle Type

Passenger Cars

Trucks and SUVs

Commercial Vehicles

💡 Important: PCD alone does not determine wheel compatibility. You must also check offset (ET), center bore, load rating, and thread size. Two wheels with the same PCD may not fit the same vehicle.

Wheel Offset (ET) and Center Bore

What Is Wheel Offset?

Offset (ET) is the distance between the wheel's mounting surface and its centerline:

• Positive offset (+) — Mounting surface is toward the front (street-side) of the wheel

• Zero offset (0) — Mounting surface is at the wheel's centerline

• Negative offset (-) — Mounting surface is toward the back (brake-side) of the wheel

Offset Tolerance

When selecting aftermarket wheels, offset should be within ±5mm of the OEM specification:

• ✅ ±0-3mm — Ideal, no issues

• ✅ ±3-5mm — Acceptable, minor fitment changes

• ⚠️ ±5-10mm — May cause rubbing, suspension stress

• ❌ ±10mm+ — Unsafe, avoid

Center Bore

Center bore is the diameter of the hole in the center of the wheel that fits over the vehicle's hub:

• Hub-centric: Center bore matches hub exactly — wheel centered by hub

• Lug-centric: Center bore is larger than hub — wheel centered by lug nuts

If the aftermarket wheel's center bore is larger than the hub, use hub-centric rings (plastic or aluminum) to fill the gap. If the center bore is smaller than the hub, the wheel cannot be used.

Complete Wheel Fitment Checklist

7 Critical Specifications

1. PCD (Bolt Pattern) — Must match exactly (e.g., 5×112)

2. Offset (ET) — Within ±5mm of OEM (e.g., ET45 ±5)

3. Center Bore — Must be ≥ hub diameter (e.g., 66.6mm hub, 67.1mm wheel OK)

4. Load Rating — Must meet or exceed OEM (e.g., 600kg per wheel)

5. Wheel Diameter — Same as or larger than OEM (e.g., 18", 19", 20")

6. Wheel Width — Compatible with tire size (e.g., 8", 8.5", 9")

7. Thread Size — Must match hub bolts (e.g., M14×1.5, M12×1.5)

Fitment Verification

⚠️ Safety Critical: Never force a wheel onto a hub if it doesn't fit. Forcing mismatched wheels can damage the hub, bend bolts, and cause wheel detachment. If a wheel doesn't seat flat against the hub, stop and verify all specifications.

PCD Adapters and Converters

When PCD Adapters Are Needed

PCD adapters allow mounting wheels with different bolt patterns (e.g., 5×112 wheel on 5×114.3 hub). They also change offset (typically +10-25mm).

PCD Adapter Considerations

💡 Pro Tip: PCD adapters add weight, increase offset, and add a failure point. They should only be used when no direct-fit wheel is available. For fleet operations, direct-fit wheels are always preferred for reliability and safety.

Why Tiegu Wheels Offer Multiple PCD Options

Tiegu produces wheels with multiple PCD options to fit diverse vehicle fleets:

• Multiple PCD patterns: 5×112, 5×120, 5×130, 6×139.7, 8×200, 10×285, and more

• Vehicle-specific designs: Wheels engineered for specific PCD, offset, and center bore

• Custom engineering: OEM/ODM with PCD, offset, and bore to your specifications

• Full certification: DOT, ISO, JWL/VIA, TÜV compliant

• A356-T6 aluminum: Same alloy as OEM wheels

• LPDC process: Low porosity, high strength, consistent quality

For fleet managers and wheel distributors:

• ✅ Multiple PCD options — One supplier for your entire fleet

• ✅ Direct fitment — No adapters needed, proper hub-centric fit

• ✅ Full documentation — PCD, offset, bore, load rating verified

• ✅ Custom engineering — We can produce wheels for any PCD pattern

• ✅ Direct foundry pricing — No middleman markup

📋 Get Free Technical Quotation

Share your PCD, offset, center bore, and quantity requirements. We'll provide competitive quotes within 48 hours with full specifications and certification documents.

Summary: Key Takeaways for Wheel PCD Measurement and Selection

• ✅ PCD definition — Pitch Circle Diameter, diameter of bolt hole circle

• ✅ Even lug measurement — Center-to-center between opposite holes

• ✅ Odd lug measurement — Center to far edge × 1.051, or center to center (skip one)

• ✅ Common PCDs — 5×112 (European), 5×120 (BMW), 6×139.7 (trucks), 8×200 (commercial)

• ✅ Offset (ET) — Within ±5mm of OEM, positive = tucked in, negative = sticks out

• ✅ Center bore — Must be ≥ hub diameter, use hub rings if larger

• ✅ Fitment checklist — PCD, offset, bore, load rating, diameter, width, thread size

• ✅ Never force — If it doesn't fit, verify specifications before proceeding

• ✅ PCD adapters — Use only when necessary, must be certified

📞 Contact Tiegu for PCD-Specific Wheels

Need wheels with specific PCD, offset, and center bore? Our foundry produces certified wheels in multiple PCD patterns with full documentation and testing.

• 📱 WhatsApp / WeChat: +86 152 5613 5588

• 📧 Email: zbw@tiegu.net

• 🌐 Website: www.tieguexport.com

• 💬 Inquiry Form: Submit Your Requirements

Response Time: Within 24 hours with technical specifications, PCD verification, and quotation.