Identify my hub type and PCD
All of the hub assemblies at Trailer Spares Direct come with seals, bearings, studs and stud nuts and dust caps.
Lazy hubs, hub drums and disc hubs and rotors all come in a range of different stud patterns and bearing combinations, so when you are replacing a hub it is important to identify the correct hub from your trailer. For example, it is possible to have a Ford stud pattern with LM (Holden) bearings.
Why Identifying Your Trailer Hub Stud Pattern Matters
Correct hub selection is essential for safe trailer operation. A mismatched trailer hub stud pattern can result in improper wheel seating, reduced load security, and potential wheel separation under load. When you're replacing a hub, measuring your existing stud pattern ensures your wheels fit securely and your bearings perform reliably over long distances.
Measuring PCD
- Identify the number and size of studs on your hub,
- Measure the PCD (Pitch circle diameter). The diagram below illustrates how to do this on 4, 5 and 6 stud hubs.
- Identify inner and outer bearing. Bearings have the number stamped into them or you can measure them with verniers. Read our article on bearing identification for details.
PCD Measurement Technique by Stud Count
For odd stud patterns (such as trailer hubs with 5 stud configurations), measure from the centre of one stud to the furthest edge of the opposite stud. For even stud patterns (4 or 6 studs), measure directly from centre to centre of opposite studs. Accurate measurement is critical — use a vernier calliper if available and measure in millimetres for precision.
Stud Pattern Identification
| Type | No. of studs |
Stud diameter (inches) |
PCD (inches) |
PCD (mm) |
Stud distance (mm) |
| HT Holden | 5 | 7/16 | 4 1/4 (4.251) | 108 | 63 |
| HQ Holden | 5 | 7/16 | 4 3/4 (4.75) | 120.6 | 71 |
| Commodore | 5 | 7/16 | 4.7813 | 120 | 71 |
| Ford Falcon | 5 | 1/2 | 4.5 | 114.3 | 67 |
| Ford 4 stud | 4 | 1/2 | 4.5 | 114.3 | 81 |
| Ford 100 | 5 | 1/2 | 5.5 | 140 | 82 |
| LandCruiser | 6 | 1/2 | 5.5 | 139.7 | 70 |
| LandCruiser | 5 | 9/16 | 5.91 | 150 | 88 |
| Nissan | 6 | 1/2 | 5.5 | 139.7 | 70 |
| Land Rover | 5 | 5/8 | 6.5 | 165.1 | 97 |
| Land Rover | 5 | 9/16 | 6.5 | 165.1 | 97 |
| Mini / Torana | 4 | 7/16 | 4.0 | 101.6 | 72 |
| Gemini | 4 | 7/16 | 100 | 71 |
Matching Bearings to Your Trailer Hub Stud Pattern
Once you've identified your trailer hubs and bearings specifications, ensure your replacement hub includes the correct bearing pair. Australian-spec trailer hubs typically use Koyo (JTekt) Japanese bearings for durability and longevity.
LM bearings are the standard for Holden-pattern hubs, whilst Slimline (SL) bearings are commonly paired with Ford trailer hub PCD configurations. Always cross-reference your original bearing numbers (stamped on the bearing race) with your hub's stud pattern before ordering.
Inspecting Bearing Condition
When inspecting your existing hub, check both the inner and outer bearings for signs of wear. Look for discolouration (rust-brown indicates moisture ingress) or excessive play in the bearing race. If your bearings are worn, they should be replaced alongside the hub — never reuse old bearings with a new hub, as the spindle and bearing surfaces wear together over time.
Still having trouble identifying your hub? Please call our friendly sales team on 07 3205 8846 or visit us in store at 4 Leanne Crescent, Lawnton Queensland.
Conclusion
Identifying your trailer hub stud pattern correctly is the foundation of safe, reliable trailer operation. Whether you're replacing a Holden trailer hub stud pattern, a Ford trailer hub PCD, or any other configuration, measuring accurately and matching your trailer hubs and bearings to the original specification ensures proper wheel security and extends bearing life. Our complete hub assemblies come pre-assembled with seals, bearings, studs, and dust caps ready for installation.
Ready to find your exact hub? Use the stud pattern identification table above, verify your PCD measurement, and browse our full range of lazy hubs, brake drum hubs, and disc hubs with rotors. If you need guidance, our Queensland team is ready to help — call 07 3205 8846 or pop into our Lawnton store.
Disclaimer
Disclaimer: The information provided in this article is for general guidance only and does not constitute professional mechanical advice. Trailer components should be installed and maintained in accordance with manufacturer specifications and Australian Design Rules (ADR). Always consult a qualified mechanic or trailer specialist for specific applications. Trailer Spares Direct accepts no liability for work carried out based on this information. Ensure your trailer is roadworthy and compliant with your state or territory's regulations before towing.