To measure your hub bore, which is also known as the centre bore, you need to find the circular opening in the middle of your wheel that fits over the hub on your vehicle's axle. Measure the diameter of this centre bore using a tape measure or calliper.
Understanding and correctly measuring the hub bore is essential, especially when considering aftermarket wheels or hub-centric rings. A properly fitting wheel ensures it sits flush against the hub, minimizing vibrations and ensuring a safe ride.
What is a Hub Bore?
The hub bore (or centre bore) is the perfectly round hole located at the exact center of a wheel. Its purpose is to locate the wheel precisely on the vehicle's axle hub. This ensures the wheel spins concentrically with the axle.
- Location: Center of the wheel.
- Function: Centers the wheel on the vehicle's hub.
- Importance: Crucial for proper wheel fitment, balancing, and preventing vibrations.
Tools for Measuring Hub Bore Diameter
According to the reference, the primary tools required for measuring the diameter of the centre bore are:
| Tool | Description |
|---|---|
| Calliper | Provides a precise internal diameter measurement. |
| Tape Measure | Can be used, though less precise than a calliper. |
While a tape measure can give you a rough idea, a calliper (specifically an inside calliper or the internal jaws of a standard calliper) is highly recommended for an accurate measurement. The measurement should be taken across the widest point of the circular opening.
Step-by-Step Measurement Guide
Here's a simple process to measure your wheel's hub bore:
- Remove the Wheel: Safely remove the wheel from the vehicle.
- Locate the Centre Bore: Find the circular hole in the middle of the wheel.
- Clean the Area: Ensure the bore is free of dirt, rust, or debris that could affect the measurement.
- Measure the Diameter:
- Using a Calliper: Open the calliper jaws and insert them into the bore. Expand the jaws until they firmly touch the inside edges of the bore. Read the measurement shown on the calliper.
- Using a Tape Measure: Position the tape measure across the bore, ensuring it passes through the exact center and touches both sides of the opening. Read the measurement. Note: This method is less accurate.
- Record the Measurement: Note down the diameter in millimeters (mm) or inches. Millimeters are standard for hub bore sizes.
Practical Tips
- Measure in multiple spots if using a tape measure to try and find the widest point.
- A digital calliper often provides the easiest and most precise reading.
- Know the standard units (mm) when comparing your measurement to vehicle or wheel specifications.
Measuring the hub bore accurately is a fundamental step in ensuring your wheels fit correctly and securely onto your vehicle.
