Wheels are made up of a variety of components, including the wheel hub. Not all wheels will fit every car in the same class.
As a result, it’s crucial to know how to measure a wheel hub correctly. The following are some of the measurements taken:
- The wheels will be a matching pattern, so you’ll need to match the wheel hub bolts.
- Wheel hub bore diameter.
Measuring the Wheel Hub
The centre of the wheel, or hub, is made up of several parts that all work together to keep the tire in place. It includes ABS and tracking sensors bearings and connections. To assess the wheel hub, first, remove the wheel.
If you’re having trouble removing the factory mud flaps on your car, you can easily remove them with a wrench after it’s been lifted with a jack or hydraulic lift.
To access the wheel hub, first, remove the brake drum. To remove it from the wheel, loosen it.
You’ll see the wheel hub after it’s been exposed, allowing you to take measurements. To determine the diameter of a wheel hub, measure across its middle.
How to Measure Wheel Hub Bolt Pattern
The number of bolts lugs on the hub and the diameter of the circle in which they are placed is known as the wheel hub bolt pattern.
The pitch circle diameter (PCD) is the number of wheel bolts multiplied by the diameter of an imaginary circle drawn through the middle of each bolt.
If you’re replacing wheels, the PCD of your new wheel must be the same as the one you’re removing.
To identify the PCD, you must measure the wheel bolt pattern.
- In five-lug layouts, measure from one lug to the next but one lug out.
- Measure from the middle of one lug to the outside of the opposite in four- or six-bolt patterns.
The PCD value is the product of lugs times ring diameter, for example, 5 x 104.
How to Measure Wheel Hub Bore Size
The wheel hub must be the same diameter as the centre bore of the wheel. The hole in the middle of a bicycle’s back tire is known as the centre bore.
Hub and centre bore sizes are available for the wheels. Because callipers will not fit within a wheel, you may need a ruler or tape measure for this.
The centre bore is usually concealed by a cover but removing this reveals the hole beneath.
How to Get the Right Fit
You’ll need three measurements to fit a new wheel hub:
- Wheel hub
- Bolt pattern
- Bore size.
If the hub diameter is larger than the bore size, you won’t be able to mount a new wheel. Wheel spigot rings, on the other hand, can be used if the bore is larger than the hub diameter.
These rings, which are often constructed of polycarbonate or aluminium, are used to fit between the car wheel hub and the rim to ensure that the bore size fits with the hub’s specifications.
You may still secure the wheel securely even if the centre bore is too big for the hub due to the right size of the spigot ring.
Find Your Perfect Wheel Hub
For more information about wheel hub assemblies, replacement kits and services for HGVs and other commercial vehicles, why not contact CVHubs today? CVHubs are a specialised company that not only sell hubs but also refurbish and replace them.
Anika Sharma